diff --git a/src/server/ml_models.js b/src/server/ml_models.js
index 19ca7440..90e8761d 100644
--- a/src/server/ml_models.js
+++ b/src/server/ml_models.js
@@ -68,3 +68,10 @@ read.on('close', () => {
   // console.log('Session ended.');
   process.exit(0);
 });
+
+// function exported for use in server.js
+export async function classifyToxicity(input) {
+  const classifier = await loadToxicityClassifier();
+  const output = await classifier(input);
+  return output; // Format: [ {'toxic', score: 0.99} ]
+}
diff --git a/src/server/server.js b/src/server/server.js
index 5fd426bb..8da4a618 100644
--- a/src/server/server.js
+++ b/src/server/server.js
@@ -1,3 +1,6 @@
+// importing toxic language ml model
+import { classifyToxicity } from './ml_models';
+
 require('dotenv').config();
 
 const fs = require('fs');
@@ -30,6 +33,12 @@ app.post('/post-question', jsonParser, async (req, res) => {
       return res.status(400).json({ error: 'Missing required content field' });
     }
 
+    // checking toxicity
+    const result = await classifyToxicity(question);
+    if (result[0].label === 'toxic') {
+      return res.status(403).json({ error: 'Question rejected due to toxic language' });
+    }
+
     // uses time stamp + random string
     const generateQuestionID = () =>
       `Q-${Date.now()}-${Math.random().toString(36).substring(2, 8)}`;
@@ -87,6 +96,12 @@ app.post('/post-answer', jsonParser, async (req, res) => {
         .json({ error: 'Missing required fields: content or questionID' });
     }
 
+    // checking toxicity
+    const result = await classifyToxicity(content);
+    if (result[0].label === 'toxic') {
+      return res.status(403).json({ error: 'Answer rejected due to toxic language' });
+    }
+
     const generateAnswerID = () =>
       `A-${Date.now()}-${Math.random().toString(36).substring(2, 8)}`;