Quote:
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~"If there's a criminal we're interested in, not necessarily in a position to arrest him, but if you're trying to track this criminal, learn his lifestyle, his movements, his vehicle number will be put into the system, and any time he comes into the city, his movements will be tracked,"
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This sounds to me like probable cause. Just not enough evidence to actually issue an arrest warrant. You can be breathalised, or have your bag searched, if the police feel they have reasonable cause for suspicion. That doesn't mean they have enough evidence to convict. If the police were only ever able to search/question/breathalise or investigate people when they already have enough evidence for an arrest then they would be unlikely to ever gain that evidence.
He's not said that anybody they don't like the look of will be tracked; he's suggesting that if they have reasonable grounds for suspicion they will continue to monitor and investigate that individual. I would have thought that constituted much of police work.