Maybe you are right. If not it's crazy. Cops have come up with reasons to arrest people that don't have a child escaping from their hotel room with bite marks. This is possibly the time to get liberal with the law. If you are going plant drugs on a person this is the one to do it to. That sounds awful. Even if the trucker was charged with something like resisting arrest, unlawful imprisonment, disorderly conduct, anything that could lead to an arrest even if it was something to hold them until the FBI got there it seems better than letting him go on his merry way. I hope you are right and there is a reason this man was let go.
JMO, if this was part of a larger investigation, LE would have learned a lot more by arresting and questioning the trucker. There are many ways to trace his movements to learn about trafficking activities without having to put him back out on the street. JMO, this looks more like local LE trying to deflect attention and keep anyone from looking too closely at activities in their little truck stop/casino/RV park town.
Duson, LA population: 1,754
Home to two large truck stops, one RV park, Super 8 Motel and a gambling casino and law enforcement that lets a child sex trafficking kidnapper walk away with no consequences.
Google Maps
Also, it was LE in Missouri who called in the FBI, not LA officials. I hope FBI agents are down there now, asking questions and checking things out.