I gotta ask what it's for. If, as I'm guessing, you've some roids a-coming you can say they aren't toxic. Whether shipping roids fed-ex is within their rules is another matter.
fed ex and UPS should never be used to ship 'illegal or shady' items because of their strict rules.
USPS will not check packages unless the dog sniffs something or something else is suspicious. they also have the right to check media mail because assholes try and cheat them shipping things other than dvd's and trying to save money