I could see doing it for a remote-mounted unit. Give it a nice, huge horn so it can pick up very weak signals. But instead of alerting on every signal, make it smart. If it's sensitive enough, it should be able to distinguish IO from CO at a long distance, based on if the signal ramps up gradually or cuts abruptly in and out. If it can accurately sniff out IO, it could give alerts to upcoming IO traps, while ignoring very weak CO until it gets a bit closer, minimizing falses from door openers, etc.
Greater sensitivity may also allow it to analyze the signals more thoroughly, allowing for better anti-falsing from crap RDs etc. With enough sensitivity, it should be easier to distinguish real POP from Crapra LO sweeps, for example.
Maybe as DSPs get faster, a powerful RD could even analyze the waveform and figure out if it's coming from a crap RD or a door opener (which are probably noiser and less stable than a police radar).
But even better would be multiple laser sensors that could be placed in strategic locations, including spots that increase the chances of picking up scatter (e.g., corners of the windshield) as well as the kill shots (tell you when to pull over)

But LCC filtering is a must.
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