Hubby worked as a firefighter in an illegal immigrant town here in Calif. They would pull up on a call and the whole family would start jibbering in Spanish. He and his 2 guys would just stand there and look at them, eventually the Mexicans would start speaking English when they realized that noone was going to speak Spanish for them.
Hubby speaks fluent Spanish. He refused to accommodate them and said that most of the time he heard them all trying to get their story straight before they came forward in English.
Lots of these calls were abuse, stabbings, etc.
When the going gets tough a lot of English gets spoken.