Depends on state laws but I always understood they were not allowed to use the older camera's in such poorly lit conditions as night produces for exactly the blinding \ safety reasons. I'd research that if I were you, just be aware that the newest ones use infra red flashes and there are no such issues.
I got flashed by one doing maybe 82 max in an 80 zone some time back, the interior light was on and the 'operator' was still poking at a big black box on the dash so I don't think I was sent a ticket because he was still setting it up after having been in a lower speed limit area.
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