[the Thing]

As said. How risky is it to cross the US-Canada and US-Mexico borders, and get on U.S. domestic flights with one or two vials of test in my luggage?
I'll rip the labels off and hide them deep in my suitcase, and check the suitcase in for the flights. If I somehow get caught would the border guards just make me throw it, or would they press charges?

[kinjutsu]

If you travel to a country with laws against having said steroids fully expect to get thrown in jail and be charged accordingly.

Also since you are considering breaking the law with what you are saying i highly suggest you stop posting these questions on an open forum.

[PhDre]

Get a prescription from a TRT doctor and ask him to provide you with a statement that says you need TRT for medical reasons.
Voluntarily present the vial, together with the prescription and your doc's statement to the border guards.
Of course, you cannot carry large amounts. Moreover, the vial should be pharma grade and match the prescription.

WARNING: I've never tried this at US borders.

[SteezeySteve]

If you have a script and it's try your good to go no problems.

If it's Mexican supplies you're trying to smuggle then it's illegal and a big deal...jail time etc.

[CaptainChardonnay]

Leave the labels on and keep them in your carry on. Vials, needles, alcohol swabs etc. Carry everything you need with a prescription. I wouldn't mention your medication unless the border guards ask what it is.

I just flew into the US, went through customs and then caught another flight to another country and went through their system this way. These people see thousands of people everyday with countless medical problems. Customs likely wont even bat an eye.

[scotian]

Possessing testosterone isn’t illegal in Canada but not having a prescription is, they’ll just take it if you’re Canadian, not sure about foreigners. The CBSA once found a bunch of boner pills I took back from Colombia, seized them and let me go, that was embarrassing.

[Menzilci]

Do not, I repeat do not rip off the labels. Just put it in your hand luggage, no one will give a shit that you have a vial of test in your brag, but if you rip off the labels it will give the impression you're trying to smuggle in something.

Someone above mentioned jail time.

Haha, jail time for possessing test? Guys last month I went to the states with Test and anavar tablets in my bag, at that time I didn't know possessing gear was illegal in USA, because in Turkey it is not and nobody gives a shit.

Long story short my friend was shocked that I came into the country with gear, I didn't even know it was illegal. Heck my luggage was even searched at the exit, the guards didn't even recognize it.