The wording "reasonble cause" is not in the bill. What is in the bill is "reasonable suspicion" And what constitutes reasonable suspicion could be a number of things including but not limited to, cannot speak nor comprehend the english language, having no form of verifiable ID.
Lets talk about "reasonable suspicion" then - what constitutes reasonable suspicion?
Not speaking english well - that would apply to many legal residents as well and would be as discrimminatory as "racial profiling".
No form of verifiable ID - presumably, a drivers license. I could agree on that. If you are pulled over or arrested, you must be able to present ID. Not sure if ID is required in other cases though.
What are the other "number of things"?
Now with that said there is also a provision in the law ( had you actually taken the time to read it ) that mandates that all law enforcement officials and agencies that are enganged in implementing Senate Bill 1070 to be trained in what constitutes "reasonable suspicion".
“3. The course of training established by the board shall provide clear guidance to law enforcement officials regarding what constitutes reasonable suspicion, and shall make clear that an individual’s race, color, or national origin alone cannot be grounds for reasonable suspicion to believe any law has been violated.
4. Provide a list of the specific forms of identification that provide a presumption that a person is not an alien who is unlawfully present in the United States.”
It's good if they can be trained in this but there is still very little to go on in identifying "reasonable suspician" excluding racial/ethnic characteristics.