A corrupt detective stole massive amounts of seized drugs and plotted with his brother to sell them back onto the streets.
McFadden, who worked for a special organised crime group, and his debt collector brother Simon McFadden, 41 then conspired to sell the drugs making themselves £600,000.
The brothers “made so much money they didn’t know what to do with it”, the jury heard.
Police raided Nicholas McFadden’s family home in Pasture Drive, Castleford, and found almost £160,000 stuffed into sacks in his garage and £20,000 hidden around his house. They also found £6,000 in his car.
Nicholas McFadden, formerly of Grove Street, Ossett, denied stealing the drugs and conspiring to supply them. He pleaded guilty to money laundering, claiming he stole the cash from a drug dealer and made money selling illegal steroids.
Simon McFadden, of Harehills, Leeds, denied conspiracy to supply.
But today (Tuesday) it took jurors less than four hours to find Nicholas McFadden guilty of stealing class A and B drugs including heroin and cocaine and both brothers guilty of conspiring to supply them.
The former police officer was acquitted of stealing amphetamine and the jury found both not guilty of conspiring to supply it.
Following the verdict, Det Chief Insp Nick Wallen, the senior investigating officer, said: “This case has focused on a corrupt police officer - this man was in fact a criminal purporting to be a police officer.
“Nicholas McFadden was devious, he was cunning and he used his position to abuse the trust of others in order to steal controlled drugs.
“Some police officers, Nicholas McFadden’s former colleagues, had risked their lives to take drugs off the streets and he, along with his brother, was putting them back there.”
After the hearing, Alison Storey, specialist prosecutor in the Crown Prosecution Service Special Crime Division, said: “The pair’s convictions today prove that corrupt police officers are not above the law they are expected to uphold and they, and their criminal acquaintances, will be brought to justice.”
Both McFaddens are expected to be sentenced on Thursday.