Lasers have become a restrict item at many playing venues either by host or owner choice as they have been deemed unsafe to use. Due to the cheap mass production of such devices they have become readily available for purchase by many people. It has been found that misuse of these devices (especially those of the green variety) have been known to cause eye damage and in severe cases (where a moron shows up with a high powered laser) burn people or burn peoples gear.
As far as red dot sights go, as long as you purchase a good quality dot sight then you should have no issue using the device in daylight. Most low end models including most asia produced clone items are noted to be difficult to view during bright and sunny situations.
"Its only a little bit on fire"