Yes. The money may be held in escrow pending the trial, but appropration by police is unjust -- and should be illegal if the person is not charged and arrested.
Edit: all of this is off-topic, as the bank can be proven the owner and the police would not keep the money.
Asset forfeiture is, and always has been, subject to judicial oversight.
There are, in fact, well established and relatively simple procedures for contesting civil forfeiture. There is a fair argument to be made that they sometimes don't work as well as they should but when you say that there is "NO judicial oversight" at all you are just just flat out wrong. You need to update your worldview if you want it to conform to reality.