Yep, check your state's regs.

In Missouri we can clean any fish that does not have a length limit, crappie for an example can't be cleaned. That does bring to question the limits they have on blue, flat, and channel. If you clean them, how do you tell the difference? We can have five blue, five flat, and ten channel on Truman. I guess leaving the tail and dorsal fin would show enough to indicate the difference.