Importance of suggestion: 5/10
Why should it be accepted: Leos shouldn't be injail that's kinda silly and unrealistic, so I suggest that players shouldn't be able to spawn as leo if they have to go to jail.
It's just a simple check with a small message like "you left while being in jail, you can't play this class" or something.
I think it's fine as it is, nothing wrong with having to serve the rest of your sentence. Police get jailed if a bribery attempt fails, so it's not at all bad as it is.
It's not a bad idea but I personally feel it fits more in a heavy RP server. As also mentioned cops do commit crimes aswell, so they can technically be sent to jail.
Can possibly implement this if others want it too but from the looks of it that's not the case. Thanks for the suggestion nonetheless!