|Joaquin Murrieta lived in the wrong century.|
While it is possible to get the property back it is a long, involved legal process. An expensive legal process that, since the police already have taken the victim's money, few people can afford the fight. Most people are helpless to defend themselves and must meekly accept the fact they have been fucked by the police.
This is not police corruption, it is an imperfectly legal operation that police agencies use to supplement their budgets. If the county sheriff wants some fancy new gadget he doesn't have to go to the county government and beg for funds, he simply sends he officers out to confiscate the money. Officers who make a big haul of booty are celebrated for their skill at highway robbery.
By the way, it is also totally a violation of the Fourth Amendment to the Constitution but courts have ruled that the Constitution does not apply.