diff --git a/src/controllers/missedBreach.controller.js b/src/controllers/missedBreach.controller.js
new file mode 100644
index 00000000..7e7aa5b3
--- /dev/null
+++ b/src/controllers/missedBreach.controller.js
@@ -0,0 +1,249 @@
+/**
+ * Missed Breach Controller
+ * 
+ * Tracks governance framework false negatives for research integrity
+ */
+
+const MissedBreach = require('../models/MissedBreach.model');
+const AuditLog = require('../models/AuditLog.model');
+
+/**
+ * Report a new missed breach
+ * POST /api/admin/missed-breaches
+ */
+async function reportMissedBreach(req, res) {
+  try {
+    const {
+      title,
+      incidentDate,
+      severity,
+      description,
+      activityType,
+      missReason,
+      missReasonDetails,
+      linkedAuditLog,
+      sessionId,
+      actualCost,
+      estimatedCost,
+      environment,
+      tags
+    } = req.body;
+
+    // Validate required fields
+    if (!title || !incidentDate || !severity || !description || !activityType || !missReason) {
+      return res.status(400).json({
+        success: false,
+        error: 'Missing required fields: title, incidentDate, severity, description, activityType, missReason'
+      });
+    }
+
+    const missedBreach = new MissedBreach({
+      title,
+      incidentDate: new Date(incidentDate),
+      severity,
+      description,
+      activityType,
+      missReason,
+      missReasonDetails,
+      linkedAuditLog,
+      sessionId,
+      actualCost,
+      estimatedCost,
+      environment: environment || process.env.NODE_ENV || 'development',
+      tags: tags || [],
+      reportedBy: req.user?._id || null,
+      status: 'REPORTED'
+    });
+
+    await missedBreach.save();
+
+    res.status(201).json({
+      success: true,
+      missedBreach: missedBreach.toObject()
+    });
+
+  } catch (error) {
+    console.error('Error reporting missed breach:', error);
+    res.status(500).json({
+      success: false,
+      error: 'Failed to report missed breach'
+    });
+  }
+}
+
+/**
+ * Get all missed breaches
+ * GET /api/admin/missed-breaches?status=VERIFIED&severity=HIGH
+ */
+async function getMissedBreaches(req, res) {
+  try {
+    const {
+      status,
+      severity,
+      missReason,
+      environment,
+      startDate,
+      endDate,
+      limit = 100
+    } = req.query;
+
+    const query = {};
+
+    if (status) query.status = status;
+    if (severity) query.severity = severity;
+    if (missReason) query.missReason = missReason;
+    if (environment && environment !== 'all') query.environment = environment;
+
+    if (startDate && endDate) {
+      query.incidentDate = {
+        $gte: new Date(startDate),
+        $lte: new Date(endDate)
+      };
+    }
+
+    const breaches = await MissedBreach.find(query)
+      .sort({ incidentDate: -1 })
+      .limit(parseInt(limit))
+      .populate('reportedBy', 'name email')
+      .populate('verifiedBy', 'name email')
+      .lean();
+
+    res.json({
+      success: true,
+      count: breaches.length,
+      breaches
+    });
+
+  } catch (error) {
+    console.error('Error fetching missed breaches:', error);
+    res.status(500).json({
+      success: false,
+      error: 'Failed to fetch missed breaches'
+    });
+  }
+}
+
+/**
+ * Get missed breach statistics
+ * GET /api/admin/missed-breaches/statistics
+ */
+async function getMissedBreachStatistics(req, res) {
+  try {
+    const { startDate, endDate } = req.query;
+
+    const start = startDate ? new Date(startDate) : new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
+    const end = endDate ? new Date(endDate) : new Date();
+
+    // Get missed breach stats
+    const missedStats = await MissedBreach.getStatistics(start, end);
+
+    // Get audit log stats for comparison
+    const auditStats = await AuditLog.getStatistics(start, end);
+
+    // Calculate effectiveness rate
+    const effectiveness = await MissedBreach.calculateEffectivenessRate(
+      start,
+      end,
+      auditStats
+    );
+
+    // Get breakdown by reason
+    const byReason = await MissedBreach.getBreakdownByReason(start, end);
+
+    res.json({
+      success: true,
+      dateRange: { start, end },
+      missedBreaches: missedStats,
+      auditLogs: auditStats,
+      effectiveness,
+      breakdownByReason: byReason
+    });
+
+  } catch (error) {
+    console.error('Error fetching missed breach statistics:', error);
+    res.status(500).json({
+      success: false,
+      error: 'Failed to fetch statistics'
+    });
+  }
+}
+
+/**
+ * Update a missed breach (verify, remediate, etc.)
+ * PATCH /api/admin/missed-breaches/:id
+ */
+async function updateMissedBreach(req, res) {
+  try {
+    const { id } = req.params;
+    const updates = req.body;
+
+    // If verifying, record who verified it
+    if (updates.status === 'VERIFIED' && req.user) {
+      updates.verifiedBy = req.user._id;
+    }
+
+    const missedBreach = await MissedBreach.findByIdAndUpdate(
+      id,
+      updates,
+      { new: true, runValidators: true }
+    );
+
+    if (!missedBreach) {
+      return res.status(404).json({
+        success: false,
+        error: 'Missed breach not found'
+      });
+    }
+
+    res.json({
+      success: true,
+      missedBreach: missedBreach.toObject()
+    });
+
+  } catch (error) {
+    console.error('Error updating missed breach:', error);
+    res.status(500).json({
+      success: false,
+      error: 'Failed to update missed breach'
+    });
+  }
+}
+
+/**
+ * Delete a missed breach (if it was a false positive)
+ * DELETE /api/admin/missed-breaches/:id
+ */
+async function deleteMissedBreach(req, res) {
+  try {
+    const { id } = req.params;
+
+    const missedBreach = await MissedBreach.findByIdAndDelete(id);
+
+    if (!missedBreach) {
+      return res.status(404).json({
+        success: false,
+        error: 'Missed breach not found'
+      });
+    }
+
+    res.json({
+      success: true,
+      message: 'Missed breach deleted'
+    });
+
+  } catch (error) {
+    console.error('Error deleting missed breach:', error);
+    res.status(500).json({
+      success: false,
+      error: 'Failed to delete missed breach'
+    });
+  }
+}
+
+module.exports = {
+  reportMissedBreach,
+  getMissedBreaches,
+  getMissedBreachStatistics,
+  updateMissedBreach,
+  deleteMissedBreach
+};
diff --git a/src/models/MissedBreach.model.js b/src/models/MissedBreach.model.js
new file mode 100644
index 00000000..6bcd5bb9
--- /dev/null
+++ b/src/models/MissedBreach.model.js
@@ -0,0 +1,346 @@
+/*
+ * Copyright 2025 John G Stroh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * MissedBreach Model
+ * 
+ * Tracks incidents where the governance framework FAILED to catch a violation
+ * Critical for research integrity and framework improvement
+ * 
+ * Purpose:
+ * - Measure framework effectiveness (true positive rate)
+ * - Identify blind spots in governance rules
+ * - Calculate realistic cost avoidance (detected vs missed)
+ * - Improve framework through pattern analysis
+ */
+
+const mongoose = require('mongoose');
+
+const missedBreachSchema = new mongoose.Schema({
+  // Incident identification
+  title: {
+    type: String,
+    required: true,
+    description: 'Brief description of the missed breach'
+  },
+
+  incidentDate: {
+    type: Date,
+    required: true,
+    index: true,
+    description: 'When the breach occurred (not when it was discovered)'
+  },
+
+  discoveredDate: {
+    type: Date,
+    default: Date.now,
+    index: true,
+    description: 'When the breach was discovered'
+  },
+
+  // Severity and impact
+  severity: {
+    type: String,
+    enum: ['LOW', 'MEDIUM', 'HIGH', 'CRITICAL'],
+    required: true,
+    index: true,
+    description: 'Actual severity of the breach'
+  },
+
+  actualCost: {
+    type: Number,
+    default: null,
+    description: 'Actual cost incurred (if known), in dollars'
+  },
+
+  estimatedCost: {
+    type: Number,
+    default: null,
+    description: 'Estimated cost if actual unknown, in dollars'
+  },
+
+  // What happened
+  description: {
+    type: String,
+    required: true,
+    description: 'Detailed description of what went wrong'
+  },
+
+  activityType: {
+    type: String,
+    enum: [
+      'CLIENT_COMMUNICATION',
+      'CODE_GENERATION',
+      'DOCUMENTATION',
+      'DEPLOYMENT',
+      'COMPLIANCE_REVIEW',
+      'DATA_MANAGEMENT',
+      'INFRASTRUCTURE',
+      'OTHER'
+    ],
+    required: true,
+    description: 'Type of activity that caused the breach'
+  },
+
+  // Why it was missed
+  missReason: {
+    type: String,
+    enum: [
+      'NO_RULE_EXISTS',           // No governance rule covered this case
+      'RULE_TOO_NARROW',          // Rule exists but didn't match this case
+      'CLASSIFICATION_ERROR',     // Activity classifier misclassified
+      'ENFORCEMENT_GAP',          // Rule exists but wasn't enforced
+      'USER_OVERRIDE',            // User bypassed framework (--no-verify)
+      'UNKNOWN'
+    ],
+    required: true,
+    index: true,
+    description: 'Why the framework missed this breach'
+  },
+
+  missReasonDetails: {
+    type: String,
+    default: null,
+    description: 'Additional context on why it was missed'
+  },
+
+  // Link to original decision (if available)
+  linkedAuditLog: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'AuditLog',
+    default: null,
+    description: 'Audit log entry where framework allowed this action'
+  },
+
+  sessionId: {
+    type: String,
+    default: null,
+    index: true,
+    description: 'Session where the breach occurred (if known)'
+  },
+
+  // Remediation
+  remediation: {
+    type: String,
+    default: null,
+    description: 'What was done to fix the breach'
+  },
+
+  preventionAdded: {
+    type: Boolean,
+    default: false,
+    description: 'Whether a new rule/fix was added to prevent recurrence'
+  },
+
+  newRuleId: {
+    type: String,
+    default: null,
+    description: 'ID of new governance rule added (e.g., inst_085)'
+  },
+
+  // Reporting
+  reportedBy: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'User',
+    default: null,
+    description: 'User who reported the missed breach'
+  },
+
+  verifiedBy: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: 'User',
+    default: null,
+    description: 'Admin who verified this was truly a missed breach'
+  },
+
+  status: {
+    type: String,
+    enum: ['REPORTED', 'VERIFIED', 'REMEDIATED', 'FALSE_POSITIVE'],
+    default: 'REPORTED',
+    index: true,
+    description: 'Current status of the breach report'
+  },
+
+  // Metadata
+  environment: {
+    type: String,
+    enum: ['development', 'production', 'staging'],
+    default: 'development',
+    index: true
+  },
+
+  tags: {
+    type: [String],
+    default: [],
+    description: 'Tags for categorization and searching'
+  }
+
+}, {
+  timestamps: true,
+  collection: 'missedBreaches'
+});
+
+// Indexes for common queries
+missedBreachSchema.index({ incidentDate: -1 });
+missedBreachSchema.index({ severity: 1, incidentDate: -1 });
+missedBreachSchema.index({ missReason: 1, incidentDate: -1 });
+missedBreachSchema.index({ status: 1, incidentDate: -1 });
+missedBreachSchema.index({ environment: 1, incidentDate: -1 });
+
+// Virtual for time to detection
+missedBreachSchema.virtual('timeToDetection').get(function() {
+  if (!this.discoveredDate || !this.incidentDate) return null;
+  return Math.floor((this.discoveredDate - this.incidentDate) / (1000 * 60 * 60 * 24)); // Days
+});
+
+// Static methods
+
+/**
+ * Get missed breach statistics
+ */
+missedBreachSchema.statics.getStatistics = async function(startDate, endDate) {
+  const matchStage = {};
+  
+  if (startDate && endDate) {
+    matchStage.incidentDate = { $gte: startDate, $lte: endDate };
+  }
+
+  const stats = await this.aggregate([
+    { $match: matchStage },
+    {
+      $group: {
+        _id: null,
+        totalMissed: { $sum: 1 },
+        bySeverity: {
+          $push: '$severity'
+        },
+        byReason: {
+          $push: '$missReason'
+        },
+        totalActualCost: {
+          $sum: { $ifNull: ['$actualCost', 0] }
+        },
+        totalEstimatedCost: {
+          $sum: { $ifNull: ['$estimatedCost', 0] }
+        },
+        avgTimeToDetection: {
+          $avg: {
+            $divide: [
+              { $subtract: ['$discoveredDate', '$incidentDate'] },
+              1000 * 60 * 60 * 24 // Convert to days
+            ]
+          }
+        }
+      }
+    }
+  ]);
+
+  return stats[0] || null;
+};
+
+/**
+ * Calculate framework effectiveness rate
+ * Requires audit log stats for comparison
+ */
+missedBreachSchema.statics.calculateEffectivenessRate = async function(startDate, endDate, auditStats) {
+  const missedStats = await this.getStatistics(startDate, endDate);
+  
+  if (!missedStats || !auditStats) {
+    return null;
+  }
+
+  const detected = auditStats.blocked || 0;
+  const missed = missedStats.totalMissed || 0;
+  const total = detected + missed;
+
+  if (total === 0) return null;
+
+  return {
+    detected,
+    missed,
+    total,
+    detectionRate: (detected / total) * 100,
+    missRate: (missed / total) * 100,
+    effectiveness: detected / total
+  };
+};
+
+/**
+ * Find breaches by reason
+ */
+missedBreachSchema.statics.findByReason = function(reason, options = {}) {
+  const query = { missReason: reason };
+  
+  if (options.status) {
+    query.status = options.status;
+  }
+
+  return this.find(query)
+    .sort({ incidentDate: -1 })
+    .limit(options.limit || 0);
+};
+
+/**
+ * Get breach breakdown by reason
+ */
+missedBreachSchema.statics.getBreakdownByReason = async function(startDate, endDate) {
+  const matchStage = {};
+  
+  if (startDate && endDate) {
+    matchStage.incidentDate = { $gte: startDate, $lte: endDate };
+  }
+
+  const breakdown = await this.aggregate([
+    { $match: matchStage },
+    {
+      $group: {
+        _id: '$missReason',
+        count: { $sum: 1 },
+        totalCost: {
+          $sum: {
+            $ifNull: [
+              '$actualCost',
+              { $ifNull: ['$estimatedCost', 0] }
+            ]
+          }
+        },
+        examples: {
+          $push: {
+            title: '$title',
+            severity: '$severity',
+            incidentDate: '$incidentDate'
+          }
+        }
+      }
+    },
+    {
+      $project: {
+        _id: 0,
+        reason: '$_id',
+        count: 1,
+        totalCost: 1,
+        recentExamples: { $slice: ['$examples', 3] }
+      }
+    },
+    { $sort: { count: -1 } }
+  ]);
+
+  return breakdown;
+};
+
+const MissedBreach = mongoose.model('MissedBreach', missedBreachSchema);
+
+module.exports = MissedBreach;
diff --git a/src/routes/index.js b/src/routes/index.js
index b2dfd548..4fb9b564 100644
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -30,6 +30,7 @@ const relationshipsRoutes = require('./relationships.routes');
 const contactRoutes = require('./contact.routes');
 const inboxRoutes = require('./inbox.routes');
 const crmRoutes = require('./crm.routes');
+const missedBreachRoutes = require('./missedBreach.routes');
 
 // Development/test routes (only in development)
 if (process.env.NODE_ENV !== 'production') {
@@ -61,6 +62,7 @@ router.use('/relationships', relationshipsRoutes);
 router.use('/contact', contactRoutes);
 router.use('/inbox', inboxRoutes);
 router.use('/crm', crmRoutes);
+router.use('/admin/missed-breaches', missedBreachRoutes);
 
 // API root endpoint - redirect browsers to documentation
 router.get('/', (req, res) => {
diff --git a/src/routes/missedBreach.routes.js b/src/routes/missedBreach.routes.js
new file mode 100644
index 00000000..20943781
--- /dev/null
+++ b/src/routes/missedBreach.routes.js
@@ -0,0 +1,31 @@
+/**
+ * Missed Breach Routes
+ * 
+ * API endpoints for tracking governance framework false negatives
+ */
+
+const express = require('express');
+const router = express.Router();
+const missedBreachController = require('../controllers/missedBreach.controller');
+const { authenticateToken, requireRole } = require('../middleware/auth.middleware');
+
+// All routes require authentication and admin role
+router.use(authenticateToken);
+router.use(requireRole('admin'));
+
+// POST /api/admin/missed-breaches - Report new missed breach
+router.post('/', missedBreachController.reportMissedBreach);
+
+// GET /api/admin/missed-breaches - Get all missed breaches
+router.get('/', missedBreachController.getMissedBreaches);
+
+// GET /api/admin/missed-breaches/statistics - Get statistics
+router.get('/statistics', missedBreachController.getMissedBreachStatistics);
+
+// PATCH /api/admin/missed-breaches/:id - Update missed breach
+router.patch('/:id', missedBreachController.updateMissedBreach);
+
+// DELETE /api/admin/missed-breaches/:id - Delete missed breach
+router.delete('/:id', missedBreachController.deleteMissedBreach);
+
+module.exports = router;