What happens when the military recruiter finds drugs in your system?

Hopefully they find out in the office prior to you going to MEPS for enlistment, if so they will allow you enough time get yourself clean and then work on processing you for enlistment. If you are not clean or have drugs in your system and are at MEPS, they will find out in about 72 Hours after your enlistment, you enlistment contract will be terminated and you will be forced to wait 1 year before you can process again for enlistment.