Steroid laws here are a bit strange, but much more relaxed than in the US.
Importing and exporting steroids is a punishable offense. So is buying and selling. But they would have to prove that you sought to purchase steroids from Thailand. I seriously doubt they are going to throw you in the can for shipping a couple of vials of test or whatever.
If you are somehow caught with steroids (small enough to be considered for personal use), you’re off the hook.
Steroids are Class IV substances according to our dumb government…
“Schedule IV: It is not an offence to possess a Schedule IV substance for personal use; however, Subsection (2) of Section (4) of the CDSA states that “no person shall seek or obtain a substance or authorization from a practitioner to obtain a substance in schedules I through IV.” Subsection (7) then states that it is an indictable offence to contravene subsection (2). Therefore, it is an indictable offence to attempt to acquire a Schedule IV substance but not an offence for possession. Section 5 provides that possession for the purpose of trafficking of a Schedule IV substance is an offence.”
This is brilliant, you do know that every department has brave crusaders that are out to protect blonde American children from the evils of all drugs right? They bust you with anything, they will make it their while.