The point isn't that people of color are exempt from the law, the point is that the way the law is written inconveniences people of color to a much larger degree than white people, no matter what their legal status. All the training in the world doesn't make anyone, including police officers, blind to race, so race is going to be considered, and in this case, Latinos are going to get the bulk of the blow because of the associations between being illegal and Hispanic in the minds of many. Quite to the contrary of what you're claiming here: the law will lead to harassing a lot of Hispanic-looking legals of color and will end up letting a lot of white-looking illegals off the hook.