According to EU Article 5(3) of the E-Privacy Directive (a.k.a \'The Cookie Laws\'), web sites that target EU users have to gain opt-in consent from users before they set a
You can disable the use of cookies for Google Analytics by specifying the {'storage' : 'none'} option when creating the tracker instance.
{'storage' : 'none'}
See Google's guide on the subject for more details.