I toyed with lasers before and the answer is it depends. If it's really bright outside it's really hard to detect. That also depends on the specific surface it's hitting too.

If you are inside your house and want to light up a guy dressed like a ninja it would be ok. If he was wearing a red flannel shirt though not so much.

They are also very prone to being affected by fog or other weather related stuff.

If anything is in between you and your target it is not ideal. I small tree branch or some leaves or whatever makes it less than ideal to me.

I personally shelved the laser idea permanently but that's just me.