Wikipedia:<p>> Reasonable suspicion is a legal standard of proof in United States law that is less than probable cause, the legal standard for arrests and warrants, but more than an "inchoate and unparticularized suspicion or 'hunch' "; it must be based on "specific and articulable facts", "taken together with rational inferences from those facts".<p>I don't see how software changes this. Police have been concentrating their patrol time (and hence stop frequency) on high-crime areas since time immemorial. This is just a more accurate tool for that. Actual detainment will still require justification based on the particular circumstances and actions by the individual, just like they always have.
As long as they're not investigating any particular person or entering any private space uninvited, I can't imagine how the constitution would limit where the police choose to patrol.
If it's based on crime statistics, this software would be heavily oriented toward black communities. My guess is that will be regarded as racist / profiling. I think even more than a Constitutional issue, you're going to run into social sensitivities around profiling.