How can I prevent the browser's back button from accessing restricted information, after the user has logged out?

I'm Using this example found on github for passport local strategy with mongoose/mongodb. The problem that I'm encountering is that when a user logs out, they can still access restricted information by hitting the back button on the browser. I'm kind of new to node.js but I would imagine that some kind of hook would need to be implemented to call the ensureAuthenticated function - located all the way at the very bottom of the code - before the back and forward buttons are executed. How can I prevent a user from accessing restricted information, by hitting the back button, after the user has logged out?

var express = require('express')
  , passport = require('passport')
  , LocalStrategy = require('passport-local').Strategy
  , mongodb = require('mongodb')
  , mongoose = require('mongoose')
  , bcrypt = require('bcrypt')
  , SALT_WORK_FACTOR = 10;

mongoose.connect('localhost', 'test');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback() {
  console.log('Connected to DB');
});

// User Schema
var userSchema = mongoose.Schema({
  username: { type: String, required: true, unique: true },
  email: { type: String, required: true, unique: true },
  password: { type: String, required: true},
  accessToken: { type: String } // Used for Remember Me
});

// Bcrypt middleware
userSchema.pre('save', function(next) {
    var user = this;

    if(!user.isModified('password')) return next();

    bcrypt.genSalt(SALT_WORK_FACTOR, function(err, salt) {
        if(err) return next(err);

        bcrypt.hash(user.password, salt, function(err, hash) {
            if(err) return next(err);
            user.password = hash;
            next();
        });
    });
});

// Password verification
userSchema.methods.comparePassword = function(candidat