AMET are merciless when it comes to Cel phones and seatbelts, even though the seatbelt law is selectively enforced. Only normal people in cars and jeepetas have to use seatbelts. Conchos, trucks, and buses are exempt.
I have no problem showing AMET or PN my license. I made a copy of my license, Insurance Card, Matricula, Cedula and Residence cards on one sheet.
When they stop me, I give them that sheet. When they ask why I 'm giving a copy, I tell them it's to avoid being shaken down by dishonest cops. I refuse to give them my real license.
If an AMET is going to give you a ticket, he can do it with the copy.
If a PN wants to try to ruin my day, he's not going to do it by holding my license hostage. The first thing I tell them is "No tengo cuarto"(I don't have any money) THE FIRST THING I SAY! (Note: I do NOT say that to AMET)
If the PN tells me to follow him, I say sure, or if he wants, he can follow me. I also tell him the farther I have to follow him, the less I'm going to give him. The max I give a PN is 50 pesos. I don't ask if I can give him something, I tell him that's it.
They ALWAYS laugh at me, say something like "aye, no eres facil", take the money, and let me go. ALWAYS.