The DEA uses "administrative subpoenas", which they are allowed to unilaterally issue for anything relevant to an investigation. Here's an older article on the

The DEA uses "administrative subpoenas", which they are allowed to unilaterally issue for anything relevant to an investigation. Here's an older article on them: http://www.wired.com/threatlevel/2012/08/administrative-subpoenas/all/ http://www.wired.com/threatlevel/2012/08/administrative-subp...