A discharge is a type of sentence given to someone who is guilty of an offence but where the court decides not to impose a significant punishment.
Whitehall sources have told the that the transport secretary declared her discharge on appointment to the shadow cabinet when the Labour Party was in opposition.
In a statement, Haigh said: “In 2013 I was mugged while on a night out. I was a young woman and the experience was terrifying.
“I reported it to the police and gave them a list of what I believed had been taken – including a work mobile phone that had been issued by my employer.
“Some time later I discovered that the mobile in question had not been taken. In the interim I had been issued with another work phone.
“The original work device being switched on triggered police attention and I was asked to come in for questioning.
“My solicitor advised me not to comment during that interview and I regret following that advice.
“The police referred the matter to the CPS and I appeared before magistrates’ court.
“Under the advice of my solicitor I pleaded guilty – despite the fact this was a genuine mistake from which I did not make any gain. The magistrates accepted all of these arguments and gave me the lowest possible outcome – a discharge – available.”
Louise Haigh is a former Special Constable, a volunteer police officer with full powers of arrest who served with the Metropolitan Police until 2011.
The has asked the Department for Transport to clarify the offence she pleaded guilty to and whether the discharge was conditional, or unconditional.