Mr Watson, 30, who appeared from custody, and Joshua Baker, also 30, of Dell Cottage, Oberlands Road, St Andrew’s, are jointly charged with importing a synthetic cannabinoid, and being concerned in the supply of it.
Mr Watson, the locally-born former English super-flyweight champion, who retired from boxing almost two years ago to the day, is charged alone with two counts of being concerned in the importation of a synthetic cannabinoid.
Mr Baker is charged alone with possessing the designer drug 4-CEC, importing a synthetic cannabinoid, and importation of it with intent to supply.
It is also alleged that he had possession a quantity of money which was all, or in part, the proceeds of drug trafficking, and failing to disclose information required by police while subject to a notice served under the Regulation of Investigatory Powers (Bailiwick of Guernsey Law).
All offences are alleged to have been committed between August and December last year.
Mr Baker was bailed with conditions not to leave or attempt to leave the island, to surrender all photographic ID, to report to the police station three times daily, to live at his home address and abide by 10pm to 6am curfew.
There was no bail application in respect of Mr Watson, who will stay on remand in prison.
He must appear in court again on these matters in November, while the case against both men will be committed to the Royal Court in December.