Inspector Peter Boatman had a 50% share in a company that sold Tasers at the same time as devising Britain’s first police training programme for the use of weapons.

Boatman was in charge of assessing the merits of Taser as head of operational training for Northamptonshire police and was regarded as an impartial expert on the weapon.

Since he left the force a little more than three years ago, his firm has provided 1,500 Tasers worth about £1m to 20 British police forces. It is the exclusive UK distributor for the US company, Taser International.

Disclosure of the apparent conflict of interest comes after Taser International, the US manufacturer, was accused of providing American police officers with share options potentially worth $1m.

The manufacturer is also being investigated over its safety claims. A Taser fires two barbed darts, felling a potential assailant with a 50,000 volt shock and causes the target’s muscles to go into uncontrollable spasm, allowing the police to capture him. The weapon, which costs up to £750, is intended to provide police with a “less lethal” option than a gun.

More than 100 deaths have been attributed to the use of Tasers in America.

Companies House records show that Boatman took a 50% stake in a start-up company, Pro-Tect Systems, in December 2000. He became a director of the firm on December 5 and resigned three weeks later, on December 27, but held on to his stake in the company.

In February 2001, Pro-Tect received the Taser contract for the UK. Within two months Boatman was acting as an adviser to the Home Office on whether to issue Tasers to British officers. He was “regarded as a national and international expert” on Tasers, Chris Fox, the former chief constable of Northamptonshire, said yesterday.

In December 2001, three months after the Home Office approved trial imports, Boatman publicly rebutted claims by Police Federation officers that Tasers could be dangerous. Boatman wrote “with sadness” to Police Review that “this technology is very effective — more than any other technique, device or equipment for establishing control over violent and dangerous subjects”.

He retired from the police on April 16, 2002. Two days later he was installed as chairman of Pro-Tect Systems. His fellow founding director and friend, Kevin Coles, had been running the firm in the meantime.

Despite the records at Companies House, Boatman insisted he had had no connection with Pro-Tect Systems before retiring from the police, and had “never been paid by Taser to do anything on their behalf”. Taser International said it was not aware that Boatman had a share in Pro-Tect Systems while still a serving police office Boatman put on a public demonstration of his confidence in the safety of Tasers by firing one at his wife, Stephanie, in a stunt staged in November 2004. He has said he believes the stun guns have never caused a fatality.

She fell to the ground screaming “like a pig” as her husband unleashed the full 50,000 volts into her back, Yet after the briefest of recovery times the 44-year-old mother got back to her feet. The Taser stun gun, it seemed, was crippling but safe.

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