http://m3report.wordpress.com/2008/11/2 ... n-america/

First time applicants for a driver’s license in San Luis Potosi must present a
birth certificate,

an official identification (either a passport, a military registration card or a voter’s registration (which in Mexico amounts to a national I.D.)

proof of domicile,

a clean criminal record reports,

plus medical and eye exams.

There is no indication that the written test is administered in any language other than Spanish.