Firstly, Deca 's clearing time is not the concern because they are testing hair not metabolites. Secondly, although he didn't trust it, Spawned gave you the correct answer way up in post #11.

Actually, it's not the follicle that's tested but rather the strand, and coincidentally a strand of hair grows for approximately 4-5 years meaning Deca (or any other tested for drug) will show up for that amount of time as long as the contaminated hair is present. That is to say, drugs only show up in the section of the hair (like the rings in a tree trunk) that are growing when said drugs are administered. You stated that you can retest in 2-3 months, this is important because you can produce a full head of new drug free hair by then.

The only way to beat a hair-based drug test is with virgin hair!