A German MP has admitted using crystal meth – but only to improve his performance at work.

Michael Hartmann, an SPD member of the Bundestag, said he took crystal meth last autumn but did not develop a dependency and kicked the drug after a month, German media reported.

Newspapers quoted his lawyer as saying that Hartmann regretted taking meth: "Without wishing to excuse his misconduct, he explains it by saying that he hoped at that time to be more efficient by drug use."

Police searched his home last week and found no illicit substances. Parliament has lifted his immunity from prosecution. Hartmann is said to be lying low and awaiting the outcome of the case against him. His party is expected to pronounce on his case next Tuesday, though it is not expected to expel him.