Bro it sucks but steroids are only illegal for all of us because a of a tiny sector of competitive sports where guys cheat. The politics says we have to keep steroids away from athletes who compete, so this is why steroids are illegal and we normal folk have to hide our identity and risk jail time just to run a cycle or two.
Don't really condone it man, if you are in that competitive realm just stay clean.
As far as your original question. You get tested and you used EQ? WTFWYT Bro?.
I had bro I consulted for years told me he tested hot for EQ a full 8 months after the last shot. He was on 600mg per week and same story, he ran a cycle during his time off and suddenly got a chance to play that season. Money signs filled his eye and went for it, bang 8 month later: Fined and suspended... Worse yet and marked 4 LIFE! - (He found me afterwards and hired me to help him to enhance performance within WADA guidelines.)
When it comes to steroids and specially long esters like EQ and DECA it is very tough to beat the current tests, and EQ has a very long detection time. Chances are that you maybe ok at just 400mg and won't test hot for it, but there is always that chance bro... "Shouldn't have done that, he just a boy."