Much poor attention paying going on in the past ,evidently never researched this here on HU Not scolding anybody , just trying to stop others from repeating these same gaffes.

It should have been known well before the trip that for visits to Mexico lasting longer than 72 hours a TOURIST PERMIT is required. Therefor that small document should clearly have bee obtained at the border at time of entry.
All border crossings into Mexico will be able to provide it , but it is up to the tourist to take the trouble to seek out the Migracion office and to ask for it .
No Mexican official will run out to you to remind you , you can ride across the border and go on for days into Baja before you encounter the severity of your oversight. Your fault.
The TVIP can be obtained at major border crossings .At small crossings it may only be availble during limited hours if BANJERCITO service is staffed.
The TVIP is and has been for ages available at the ferryport customs
terminal at Pichilingue .
The TVIP is issued by BANJERCITO because it does the finance aspect for the
border but it also operates more general banking services for army personnel and the public in offices in various
cities under the same name BANJERCITO . However these regular banks have no
connection to the issuing /cancellation of TVIPs.
The cancelling can only be done at the BANJERCITO present at
customs terminals at the border when you are preparing to leave Mexico .AGAIN , you are responsible to start the process of cancellation and that should be easy to remember if you do not want to
lose your security deposit.

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http://advrider.com/index.php?thread....207964/page-5 then scroll down to post #93