I've competed in the USBF and the WNBF. Typically I've been subjected to polygraphs before the morning prejudging, and then urinalysis before (or sometimes after) the evening shows. Most organizations will agree on about 90% of what's "not allowed", but some will differ as some OTC supplements can be viewed as questionable depending on how strict you want to be. Both orgs I've listed, as well as any others you may find (OCB, NGA, NANBF etc) have their own web sites, so you can always hunt down info online.
Additionally, as you've already said, worrying about people who try to 'beat the test' is just an exercise in futility. Some people always will, so just do this for yourself and leave it at that.