"Re-opened" no. Expungement of the charge etc possibly.

Can someone get aiding and abetting if someone is selling drugs in your house?

On your facts, the short answer is yes.

My bf is being sued by a girl he met online years ago for criminal charges for sexual pictures she sent him.

No. He should consult with an attorney, however.

Is it possible for me to speak as a witness in defense of a parole violator without being subpoenaed?

Contact your friend's counsel and advise him of your wishes. You have no control over the subpoena that may emanate from the DA.

Is a hotel liable for injuries if fall in a hotel room

Possible. It would come down to why is the bedspread in a place for you to trip over it? Consult with a personal injury attorney.

With the complexity of your situation, I would first suggest you contact a labor law attorney and then consider the use of a personal injury attorney.

I was in a not-at-fault car accident receiving soft tissue injuries...

Please consult a good, local personal injury attorney.

Is this a civil or personal injury case?

Your friend has a number of causes of action, some of which would be against the county. As such, claim must be made before a suit can be filed....

Can a I bring a personal injury lawsuit against a restaurant due to a bone in the chili cheese fries breaking my tooth in half?

YES. Contact a good personal injury attorney somewhere in the Inland Empire.

Can I sue my insurance company for settling a personal injury claim without proof of injury just to avoid going to court ?

To answer your main question-no.