For your personal, non-commercial use, yes. If you’d like to download a mugshot you find here to use as a profile picture, avatar, etc., have at it. It would be super-cool if you let people know you found the image at Muggn, but that’s not a requirement. It would be super-cool, though.
Commercial use of the images here - we generally frown on that. The images you see here are in the public domain, but we’ve done a lot of work to find them, weed out the uninteresting ones and post the good ones here. It would be far less than super-cool to have somebody try to make a buck off of our hard work; so we don’t allow commercial redistribution of images housed at Muggn unless you’ve been given express permission to do that. Contacting the Mugmaster would be how that happens.
Complete information can be found in our Terms of Service. We’ve tried to make it pretty clear there that personal, non-commercial use is fine by us.
And, you know, letting people know you found the image here would be super-cool.