LASR only looks for impacts in the target zones you designate, and when the laser enters the zone, it sees it as a laser impact and marks it appropriately.
As far as the laser leaving the target zone, to an "unzoned" area, and coming back in,
Yes, the software will declare new hits. We call this "lightsabering," and it has always been a way to cheat. On the other hand, you can also use a flashlight and get perfectly center-mass hits, or you can get close to point-blank range and use a laser pointer, or cheat yourself in any other number of ways. Just like pressing start on a shot timer at the live range doesn't automatically make you faster, some things are always going to be "up-to-the-user" to get the full training value.
If you are wanting to avoid light-sabering, you can:
1. Make your target zones larger
There is no reason why your target zones need to perfectly outline your target or area you would consider a "hit". You can simply make the target zone larger, and while light-sabering is still possible, the hits will generally be detected before they drag the laser onto a portion of the target you would consider a hit. This is because LASR always marks the hit location as the first place the laser appeared.
2. Use backdrop zones
If the backdrop zone detects the hit first, it will not mark it as a hit on the main target zone. You can see an example of this in our LASR: Steel Challenge video below: