He was charged with three counts of attempted extortion.
Prado allegedly steered business to a tow truck operator following three accidents in 2006. He then allegedly solicited more than $1,100 from the operator who was secretly working for the FBI.
A listed phone number for Prado couldn't be located and a department spokesman didn't have the name of an attorney for Prado.
The FBI says the investigation is ongoing. Nine people have been charged, including six current or former officers.