I've been following it for a few years now... I know of hundreds of incident in the US... in all sort of scenarios. A lot of the incidents that are "questionable".. see the money returned to the individual eventually.
I don't know of any cases in Canada that didn't involve criminal charges, crime proceeds, etc.. not saying it hasn't happened.
The police get to keep a portion of the seizure.. is why they do it.
From wikipedia, not my favorite source but presumably in the ballpark of truth. About 10% get challenged in court. Imo mostly due to cost/benefit but an alternate possible theory is because the money was dodgy but 85% not being charged with any crime leads me to believe it's not nearly as dodgy as the govt would like the public to believe.
"In 1986, the Department of Justice's
Asset Forfeiture Fund took in $93.7 million; in 2008, it took in $1 billion.
[9] Much of this growth happened in the past decade; one analysis suggested that seizures had grown 600 percent from 2002 to 2012.
[43] From 2005 to 2010, government seizures of assets from both criminals as well as innocent citizens went from $1.25 billion to $2.50 billion.
[16] In 2012, over $4.4 billion were seized through forfeiture
[44] as compared to an estimated $4.7 billion American suffered as losses from criminal burglary.
[45] Federal authorities seized over $4 billion in 2013 through forfeiture, with some of the money being taken from innocent victims.
[30] In 2010, there were 15,000 cases of forfeitures.
[16] Over 12 years, agencies have taken $20 billion in cash, securities, other property from drug bosses and Wall Street tycoons as well as "ordinary Americans who have not committed crimes".
[43] One estimate was that in 85% of civil forfeiture instances, the property owner was never charged with a crime.
[11] In 2010, there were 11,000 noncriminal forfeiture cases.
[16] In 2010, claimants challenged 1,800 civil forfeiture seizures in federal court.
[16]"
US has gone completely off the rails with this. Criminal asset forfeiture makes a lot of sense. Civil asset forfeiture is robbery.