I got popped when I was 18 at san ysidro about 10 steps away from USA door freedom
Personally I would not risk it, but allegedly had success in 2018 moving aranda ketamine vials
and actavis syrup/farmapram across
If you are within 50 miles of border that is a bad place to source gear/peptides. You are automatically labeled as an American, and tourist, and they will do everything in their power to price hike and potentially scam you.
I have been to jail and prison in TJ, it is not fun and way worse than USA CDC. the people and police force besides the tourists spots you are spending $$$ at dislike Americans, they don't even like Mexican Americans, they have a special name for them called pochos
forget Mexico, support a sponsor here