Talk:Investigator/@comment-4488079-20140320095810

It needs 5 seconds to perform a scan : first its target flickers in red, and 5 seconds later it flickers in blue, meaning that the scan is complete.

In a mission with the usual pace, you'll scan about 3 things, usually containers or consoles, and perhaps 1 enemy.

If you are willing to spend the 5 seconds next to an unaware enemy for him to be scanned, then you could just as much scan it yourself.