Police have warned people against using the illegal drug mephedrone after a number of seizures in north Devon.
Police found synthetic stimulants, some of it believed to be mephedrone which is sometimes called "devil's dust", at addresses in Bideford and Barnstaple.
The class B drug was found on a 33-year-old man who was later bailed until 6 April.
Sgt Graham Thomas said some users of the drug were unaware of its physical dangers or the legal consequences.
In April 2010 mephedrone, which is thought to cause fits, anxiety and feelings of paranoia, was classified as an illegal substance.