I obtained my trembolone from USA by mail, and there was no problem but the time to clear customs in Mexico, it delayed a bit more or less 6 days ( I know it because I checked the schedule of my package daily), but that is all.
Furthermore, Roids are legal in Mexico, I mean they are supposed to be obtained with a prescription (restricted the sale and use), but obtaining them or the possession and use is not a fellony as far as I know.