How does your school currently assess language proficiency and how does it use the results?

I live and teach in CA. All schools in the state give students language proficiency testing when they enter school. The students are then identified on a scale from non-english to proficient. The students are then placed in classrooms where the teacher has been trained in language acquisition ( CLAD or SAIDE teachers) and the class everyday gets 30 minutes of language acquisition activities. Depending on the school, some children go to a different classroom, some get individual instruction from a specialized teacher, and some use different textbooks. Yet, when state testing happens ALL students are given the same test in English and not given special help.