"Mortlake was taken away for questioning about some extremely odd ferrets, but that's the Committee on Experimental Charms, thank goodness ......"
-- Arthur Weasley (CS3)
A committee with an office inside the Ministry of Magic with responsibility for keeping track of new charms, and likely suppressing the illegal ones
The Committee was founded by Balfour Blane, who lived in the late 1500s-early 1600s (FW).
It dealt with Mortlake's "odd ferrets" captured in one of the many raids Mr Weasley was involved in during a particularly busy night (CS3).
The Committee is located in the Ministry of Magic, although we are not sure exactly where. A Ministry witch outside Umbridge's office thought Harry's Decoy Detonator had escaped from the Committee's office, as they had previously lost a similar charmed duck (DH13).