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It seems like it does laser scans quite often. Is it so it can identify enemies, and, if so, why did it not do a scan on Jack before he said "Tech Four-Nine. Jack Harper."?

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When in the movie did this happen? –  coleopterist Aug 8 '13 at 5:29
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I believe he did it just to identify himself before the drone had a chance to fully activate. It might also have been the last step to activate the drone after he fixed it. By identifying himself first, the drone would not have had to scan him but know him right off. From a plot side of the equation, by Jack stating his name and tech # prior to full power-on of the drone, it provides a way for when Jack finds his wife in the stasis pod later in the movie. It makes it so we are used to the process. Not sure this is a complete or definitive answer, so putting it into the comments. –  Paulster2 Aug 8 '13 at 10:17
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3 Answers

Drone #166 (the very first one Jack repairs, and the one I assume you are referring to) actually does a scan on Jack. Not with its lasers, but with its "eye".

The drones are equipped with both an "eye", which seems to be mainly used for navigation and close range scans, and lasers, which seems to be used for long range scans as well as to scan in multiple directions at once.

As for the second meeting with the drone (down in the New York Public Library,) the second scan, which is done with the lasers, is just there for some extra seconds of doubt to make the audience unsure about whether the drone will actually recognize him or not.

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Drones scan objects and surroundings in order to find Scavengers. (Navigation probably is done by GPS and/or radar, because drones do not scan during flight.)

As for why Jack identifies himself, there could be multiple reasons. I think it is just human nature to prove innocence against an armed opponent and it could be a reflex of Jack on the just "awoken" drone. Furthermore, maybe Jack identifies himself just to speed up the scanning process in order to get the drone in normal operation mode quickly. But most important: it could also be protocol, because later on we learn that the drones are ordered to eliminate all humans.

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There's nothing indicating that the drones didn't scan during flight. Sure, they obviously use some kind of GPS technology to navigate between markers/beacons, but they'd definitely need some kind of scanner to navigate in caves and buildings, and to avoid things that might enter or already be in their flight path –  Tom Aug 17 '13 at 20:23
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When Jack repair first drone i.e 166, it scan Jack after activated Jack said "Jack Harper, Tech 49" because scan process take time.

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