A violation of probation ("VOP") is filed when a person who is on probation violates a condition of their probation. The violation can be techincal, a new law offense, or both.
A technical violation occurs when a person on probation does something or fails to do something required by probation. This includes, but is not limited to, a positive drug test, failure to do community service, failing to take a required course, having contact with a person where the court ordered no contact as a condition of probation, et cetera.
A new law offense violation occurs when a person on probation is charged with a new crime. So a person can be on probation for sale/delivery of a controlled substance and while on probation they are arrested for a new alleged crime.
And of course a person can have both technical and new law offense violations as part of the VOP. Probation can also amend an affidavit of VOP to add allegations that were not previously known.
Trafficking could mean a couple things. Usually trafficking refers to a kind of drug charge involving a large quantity. Drug trafficking charges carry minimum mandatory prison sentences. There's another crime called Dealing in Stolen Property which is also referred to as trafficking. So it depends what the nature of the trafficking is. Bottom line is a person can be placed on probation and violate a number of ways. Often there is no bond when someone is held on a VOP but the court is allowed to grant a bond. Your friend should consult an attorney to file a motion for bond, investigate the VOP and new law offense, try to resolve the cases with the state, or take it to trial. Your friend is likely facing serious charges and needs an attorney.