The Crown Prosecution Service says it has "carefully considered a file of evidence" gathered by police following newspaper allegations against former Co-op Bank chairman Paul Flowers.
Clare Stevens, from CPS Yorkshire and Humberside’s Complex Casework Unit, said she believed "there is sufficient evidence and it is in the public interest to charge Paul Flowers with possession of Class A and Class C drugs relating to an incident on 9 November 2013".
Mr Flowers has been charged with possession of cocaine, methamphetamine and ketamine, the CPS said.
More top news
Another mild night
Tracey Crouch says she hopes the Football Association learns lessons from the "sorry saga" of harassment and bullying accusations.
During a discussion on the Me Too campaign, the model revealed she had been attacked as a teenager by an industry professional.