What letter?TSauretBaxter said:Thanks! The letter also says that the purpose is for temporary residency.. is that normal? even though he's applying for PR?
(I wouldn't worry too much because a background check is a background check so he should proceed).
ETA: If he has a chance today, have him pay the fees at a bank so he doesn't need to worry about it in Mexico City. And, make sure he takes a recent utility bill (comprobante de domicilio) and birth certificate ... the requirements are at http://www.pgr.gob.mx/Servicios/Constancia/antecedentes%20registrales.asp