Experimental Charms

"I bet it sneaked up here from Experimental Charms, they're so careless, remember that poisonous duck?" A ministry witch on a decoy detonator.

This is a department in the Ministry of Magic and is mentioned once in Harry Potter and the Deathly Hallows.

On 2nd September 1997, when Harry Potter , Ron Weasley and Hermione Granger broak into the Ministry of Magic. Harry wandered off and forced his way into Dolores Umbridge 's Office. On his way in he had used a Decoy Detonator and when he emerged from the office, a group of people were gathered around it. Their theory was that it had come from Experimental Charms as they had a reputation of being careless, having once left a poisonous duck to roam around the ministry.

It is possible that the Comittie of Experimental Charms are the people who work in this department.