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Don't let the fox guard the henhouse.

Don't assign the duty of protecting or controlling valuable information or resources to someone who is likely to exploit that opportunity. You're going to put your ex-convict brother-in-law in charge of your business? I can't tell you how to run your company, but don't let the fox guard the henhouse.
See also: fox, guard, let

fox guarding the henhouse

A person likely to exploit the information or resources that they have been charged to protect or control. My sister is going to put her ex-convict brother-in-law in charge of her business, and I'm worried he'll be like a fox guarding the henhouse.
See also: fox, guard, henhouse

cock in the henhouse

The only male in an all-female environment. Getting a male teacher is a big deal when you go to an all-girls school! Finally, a cock in the henhouse! My grandpa always complains that he's a cock in the henhouse living here with my grandma, my mom, and my twin sister.
See also: cock, henhouse

fox in the henhouse

Someone with bad intentions. (A fox would prey upon hens in a henhouse.) I'd watch out for him if I were you—he walks around here like a fox in the henhouse.
See also: fox, henhouse
References in periodicals archive ?
Following their performance at Palatine High School, the Henhouse Prowlers will resume a touring schedule that takes them to nearby cities like McHenry and Chicago, to international locations like London, England, and Oostkamp Belgium.
By designing their henhouse thoughtfully and adorning it with stained glass and artwork, the Daggetts have made it a true centerpiece of their lush gardens.
This could even have the potential for catching those in the outlying towns, once it gets rolling," said Kathy Merriman, who runs the Henhouse booth with her father Tom Hensley, and her brother, Tommy Hensley.
This is what happens when the fox is guarding the henhouse.
California, however, becomes the first state to require that all egg-producing chickens be kept in more spacious enclosures or free to roam a henhouse.
The EPA's consistent polluter-biased practices have amounted to industry foxes having a party in the henhouse.
And bills are higher for the fluorescent henhouse lights and fuel.
The article quotes Paul Light, a professor of political science at NYU: "It's the fox designing the henhouse.
Peter Sprigg of the Family Research Council labeled Condi's crack "profoundly offensive," and larded it on by attacking the selection of Dybul for the post: "[P]utting a homosexual in charge of AIDS policy is a bit like putting the fox in charge of the henhouse," he declared.
You can't cut a swath through the henhouse without ruffling some feathers.
The Fox in the Henhouse By Si Kahn and Elizabeth Minnich San Francisco: Berrett-Koehler, 2005 320 pages; $14.
If the UN allows the fox to guard the henhouse, so to speak, it surely can't be trusted to oversee fairly the use of the Internet to promote freedom and human rights.
Of course Bush, in his "confronting reality" speech, addressed the misappropriation of relief funds issue, promising, in essence, that the wolves can be trusted to watch over the henhouse.
For many, many years since 1976, we have had the equivalent of the fox guarding the henhouse.