I had a friend decades ago, that really did travel to Oaxaca looking for weed/seeds.
Unfortunately, the Mexican police caught him and things went a lot like that Midnight Express movie for the next month.
Long story short, daddy had to spring for $25K. Half to a nice Mexican lawyer, the other half to the police, and he was allowed to leave Mexico. That was in the late '70's. Now days, he might just get slaughtered by an angry cartel member.
Side note: 1970's Mexican police were kind of mean. They told him, while in custody, that only gay people smoke that shit and that real men drink tequila. (true story.)
You don't just wander into a foreign country looking for seeds, you damn well better have people you trust there first.