Just because you can doesn't mean you should.
We're all for creativity, but this Doc Brown in the making is far too fond of lasers and using them to make things burn/melt for us to be able to fully endorse his activity.
Drake Anthony is a 22-year-old student who built a 40w laser 'shotgun' that is apparently completely legal to make and have in the US, which isn't surprising. What is surprising however is what it's capable of. Lasers are finally becoming a real threat. Wonderful.