Please Help Me Identify This Snake

[tashy]

Hello! My friend had a snake come into her room several times and when she took it to the pet store they told her it was a corn snake. I've been keeping it as a pet for about 3 weeks and it seems very uncomfortable with people/being in a cage and will not eat. One of my friends is sure that it's a milk snake, in which case it is a native snake to my area and I can release it. If you can tell the difference please let me know asap!!!!

Also, if it is a cornsnake, would it be safe to release it? Either way the snake's been living in the wild and does NOT seem happy as a pet, but the cornsnake isn't native to this part of the US and I wouldn't want to release it if it was unsafe.