CALLS to a crime hotline have led to 500 arrests so far this year.
Drug dealers have been particularly hard hit by calls to Crimestoppers in West Yorkshire.
Dealers have been arrested and drugs worth more than £500,000 seized.
The overall arrest tally is a fifth more than the 2003 total for the county and stolen property worth more than £1m has been seized.
People phone the Crimestoppers number - which also doubles as the Dob In A Dealer number - free and anonymously.
They can get a cash reward if the information leads to an arrest and conviction.
The payment system uses numbers so Crimestoppers never know who gave them the vital tip-off.
Almost two-thirds of the 500 arrests have been for dealing drugs and the arrests overall have cleared up more than 700 crimes.
Crimestoppers Regional Coordinator Det Sgt Ian Froggett said: "The arrests for drugs offences is a strong sign that the public at large will not stand back and tolerate this evil trade.
"Sixteen people have been identified and dealt with for robberies while a similar number have also been dealt with for burglaries.
"We've even had a caller providing substantial information that helped with an arrest for murder."
He added: "The amazing thing is that we don't have a clue to the identity of anybody who has rung us.
"Our quickest arrest was within 20 minutes of the call and resulted in a drug dealer being arrested with 30 wraps of drugs and a pocket full of cash.
"Another arrest resulted in somebody previously unknown to the police being arrested after 12 calls to Crimestoppers which helped build up a picture and enabled the police and Trading Standards to put a halt to a prospering DVD and CD copying business."
He added: "As for how many crimes have been prevented by these 500 arrests, we'll never have an answer for that."