Aiyee! Yes... but at some point you need to draw a line, where you think the odds of difference are unlikely.

Alas, within 15 years we'll probably just put in the RFID tag of the source and be done with it. Then, when the paper is done, we'll go home to our apartments which will unlock when they sense our presence, and we'll participate in corporatation-approved and -monitored recreational activities.