Legal Question in Criminal Law in Pennsylvania

Re: jailing

I think you're asking about a detainer, not a retainer.

A detainer is when you are on probation or parole, and you are being charged with a violation of the conditions of probation or parole. You are entitled to a "Gagnon I" or preliminary hearing on the violation, and then a "Gagnon II" hearing to determine whether or not it was actually violated. There doesn't necessarily have to be another criminal charge.

If this is not what you are referring to, repost with more information.