Jeeper79 said:
I worked in Mexico at one point, traveling over the border and back everyday.
Temporary works visas felt like a joke. Like just very unofficial.
I had some fireworks in my trunk that were confiscated on the Mexico side. I'm sure the had fun with those.
Visas aren't like that anymore. Lots of trips to the INM and your US-side embassy or consulate. Getting a residency and/or work visa in Mexico is no joke.
I left yesterday and the process was painless. Walk up to an unattended booth and have your picture taken and do the electronic fingerprint and that's it. Not even an exit stamp for your passport.