RE: laser sight for bow
Are you talking about an actual laser sight that projects a beam of light onto your target, or a light that shines on your pins to keep them bright when the light starts to fade? If it is an actual laser I don't think they are legal for hunting in most states, and I don't think they are legal for most target shooting. At least I have never seen or heard of one for target archery.
And for hunting deer I don't think a red laser would work all that well on a deer being the color of the fur. Not to mention the laser sights I have used in the past didn't work all that well in the sun. I haven't had one in years though, maybe they have gotten better?
Putting a laser on your bow will show you how much you move around during the shot though and it will show grip flaws that cause torque too.
I wouldn't want to hunt with one. I have used the lights that light up your pins as well and didn't care much for them either. With decent fiber optic sights you should be able to see your pins in legal light, unless maybe you hunt deep in the woods with lots of cover.
Paul