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poacher turned gamekeeper

A person whose job or role has completely changed, from one extreme to another. Primarily heard in UK. The notorious computer hacker who once stole money from unsuspecting Internet users now helps the government catch other hackers—it's a strange case of poacher turned gamekeeper.
See also: gamekeeper, poacher, turn

old poacher makes the best gamekeeper

Prov. The best person to guard something is someone who knows all about how to steal it, so he or she can anticipate what thieves might do. We should hire the computer hacker to design computer security systems. An old poacher makes the best gamekeeper.
See also: gamekeeper, make, old, poacher

a poacher turned gamekeeper

someone whose job seems to involve working against the person who is now doing the job which they did before
Usage notes: A poacher illegally kills and steals animals on someone else's land, and a gamekeeper's job is to stop this from happening.
He used to be the the union rep but now he's in management - a case of poacher turned gamekeeper.
See also: gamekeeper, poacher, turn
References in periodicals archive ?
One of the Mambas, 22-year-old mother Leitah, proudly says: "Most poachers are men.
Outdated weapons The replies have also revealed that assault rifles like AK- 47 and AK- 56s were used by the poachers, outpacing forest guards who continue to use outdated weapons.
A recent fire on Mount Kenya, the country's tallest mountain, revealed how poachers are resorting to dangerous techniques to kill elephants.
Anglers who see what they suspect to be illegal fishing should ring 0800 80 70 60, preferably while the poachers are still active.
The failure of the authorities to effectively combat bird trapping is evident in the behaviour of the poachers," the report stated.
A simple request for "a little help here" may turn a poacher into a contributor and keep that revolving door spinning.
Oblivious to that, Jolly Poacher was bowling along at the head of affairs and ultimately scored by three-and-a-half lengths from Brickfield Class in 26.
At Bhalu Khola where the incident occurred, we found a dead rhino with its horn missing and the poachers had absconded," said Narendra Babu Pradhan, CNP chief conservation officer.
It was estimated, that when the prices for ivory and rhino tusks were at their peaks in the 1980s, a successful hunt could yield a poacher more money than twelve years of non-poaching work (Chadwick 1993).
The menu boasts that "the poacher likes his ale", and I know I did - although, strangely, you are not told what sort of beer is being used.
In addition to achieving a design patent for the silicone egg poacher marketed as the poachpod[R], Fusionbrands[R] received a highly respected and rare-to-the-industry Method Patent in the U.
Wildlife officials recently arrested a notorious poacher near Chilika Lagoon, Asia's largest brackish water lake.
It's a wonderful display of the intelligence of these animals, but knowing what a poacher would do when seeing an elephant, it's not the smartest idea a human has ever had.
As law enforcing agencies are combating poachers who kill for both commercial reasons as well as to appease hunger, Botswana is yet to prosecute a commercial poacher.
We still hear of the occasional poacher and the bailiffs are still there with the aim of protecting the stocks.