Tracking Individual Users with Google Analytics Custom Variables

I've been working on a support center for my company and we need to track individual users when they login. If possible we would like to track details as well such as pages visited and time spent on the site as well. I'm able to track how many people login to the site using a custom variable, but I am unable to track individual users. Here is the code I've been using to try to grab the individual user id:


$(document).ready( function() {
var welcomeEmail = document.getElementById('welcome_email').innerHTML;

var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-30086012-1']);

var welcomeEmail;

if( $('#welcome_email').length > 0 ) {
                //This block of logic makes sure that the welcome_email element actually exists, it will not exist if a user is not logged in yet
                welcomeEmail = document.getElementById('welcome_email').innerHTML;
}

  _gaq.push(['_setCustomVar',1,'UserEmail',welcomeEmail,1]);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

What am I missing/doing incorrectly. Appreciate any feedback.

Solution

That is a violation of Google Analytics terms of service. See number 7 PRIVACY.

7.PRIVACY . You will not (and will not allow any third party to) use the Service to track or collect personally identifiable information of Internet users, nor will You (or will You allow any third party to) associate any data gathered from Your website(s) (or such third parties' website(s)) with any personally identifying information from any source as part of Your use (or such third parties' use) of the Service. You will have and abide by an appropriate privacy policy and will comply with all applicable laws relating to the collection of information from visitors to Your websites. You must post a privacy policy and that policy must provide notice of your use of a cookie that collects anonymous traffic data.

And

While the username or user ID is not directly PII, if it is used to tie to a person from a backend system…that’s a violation of the Terms of Service.

Google Analytics is not the tool to use for this type of tracking. A custom backend solution that is hosted on your own servers is the better way to go.