One of the justifications offered to support the child separation policy at the SW border is a humanitarian one of liberating children from persons who are bringing children into the US to "sell" or otherwise "enslave" them - aka human traffickers.

Since the zero tolerance policy was rolled out (ca April 2018) approximately 30,000 (alleged) family units were apprehended, along with approximately 15,000 unaccompanied children. 

What I can't seem to find is how many persons have been actually charged with human trafficking since April. (Conviction may take longer, but charging ought be rather prompt - so let's limit the scope to "charging" ).

**Initially** I make no distinction between sex or labor trafficking (which would likely be a major concern to those concerned about the safety of children after arrival). Another category that might fall into the trafficking arena would be persons who are "paid escorts", although this category is (likely) more benign than sex and labor. 
Edit: I will restate this question in Law SE to be more specific, my thanks to commenters