It can matter. Many more people speak Spanish in this country than French obviously, and you don't have to be fluent. There are classes for law enforcement officers called "Survival Spanish" and Spanish for Cops". These classes just teach some basics. Below is an example of what one course for police teaches officers. The course is three days.
*To correctly pronounce the Spanish alphabet.
*To recite common arrest expressions in Spanish.
*To recite numbers, days of the week, and months of the year.
*To identify a minimum of 10 Spanish danger expressions.
*To identify common parts of the body in Spanish.
*To recite common Spanish courtesy expressions.
*To pronounce street Spanish terms.
*To pronounce common Spanish drug terminology.
*To request in Spanish information needed to complete.
*To identify danger words commonly used preceding an assault.
*To identify certain commands useful to an officer attempting to stabilize a situation.
*To identify the correct way to use arrest phrases when taking a non-English speaking person into custody.