If you are still on paper and being drug-tested, I would stick to only using testosterone for as long as you are on supervised release. Even if you are not currently being drug-tested, if you walk into your probation officer's office looking noticeably muscular, he or she could choose to have you drug-tested at any time, and potentially sent back to prison if you are violating the conditions of your supervised release. The feds won't typically test you for steroids on their standard drug tests, but they can if they have a reason to do so. And their steroid tests aren't very comprehensive, but they can easily pick up the metabolites of different steroids...dbol, anadrol, tren, EQ, etc. I know guys who tested positive for steroids in halfway house and on supervised release who got sent back to prison.
Speaking for myself, I stayed clean for the 3 years I was in federal prison. When I was in halfway house, I knew they were testing for recreational drugs, but not for steroids, so I used some test and a little anavar. But they never tested me for steroids. The steroid tests are much more expensive than the standard drug tests, so they only use them if somebody tells them to do so.
However, when I was on supervised release, my probation officer noticed that I was looking a lot bigger and more muscular, veins, red face etc, and she specifically had me tested for steroids. I was only using test by that time, no other steroids, and I passed every drug test just fine.
So the best advice I can give you, using my own experience, is that if you are going to do a cycle, stick to only using test as long as you are on supervised release. I would much rather do 1-2ml of test cyp per week, than start throwing in other compounds like tren or EQ, or especially stuff like Deca that takes a very long time to clear your system.
And when you go in to see your probation officer, make sure you go in covered up...long sleeved shirts, baggy clothes, etc...so that they don't notice that you are getting more muscular. Don't do anything to draw attention to yourself.
Stay safe, my friend.