it costs too much extra to check somebody for that. even the military, from what i have heard, doesnt check for that, unless they have good reason to (i.e., you resemble Jay Cutler)
there more test in 100mgs of test propionate than in 100mgs of test enanthate, due to the weight of the enanthate ester weighing more than the propionate ester. But i like enanthate, the frequency of injections are less, leaving less scar tissue