They were bailed after being interviewed at the police station during the afternoon.
They were originally arrested and questioned early in December on suspicion of harassment and have been on bail since then.
‘On Friday 1 May, Guernsey Police arrested a 59-year-old man and a 59-year-old woman on suspicion of misconduct in public office and an offence under the 1948 Reform Law,’ said a police spokesman last night.
‘These two individuals were first arrested on suspicion of harassment in December 2025. These new arrests directly relate to the same investigation.
‘Enquiries into all matters are ongoing and Guernsey Police will not be commenting any further at this stage.’
After returning home, Deputy and Mrs St Pier provided a statement in which they once again asserted their innocence.
'We were released without charge. We unequivocally deny any wrongdoing,' said the couple.
The Guernsey Press had submitted questions to the police earlier in the day as the couple's most-recent bail extension expired.
The expiration of their bail period required them to report to the police station, where they were arrested on suspicion of the additional offences, interviewed and bailed with basic conditions.
Deputy St Pier has been in public office since being elected to the States in 2012. He has been the Policy & Resources Committee’s vice-president and treasury lead since last July. Under Guernsey law, offences can also be committed by someone facilitating misconduct in public office.
Other members of P&R found out about the latest development in the St Piers’ case a few hours after the couple were re-arrested.
‘At the time of being asked questions by the Guernsey Press, the committee was being briefed on the situation.
'We will make a statement as soon as possible on Saturday morning,' said P&R president Deputy Lindsay de Sausmarez.
The police investigation relates to matters which previously led to findings that Deputy St Pier had broken the States members’ code of conduct.
In November, the States Assembly rejected a recommendation from its standards commissioner to suspend Deputy St Pier over a phone call with a national journalist who was preparing a story concerning complaints about paediatrician Dr Sandie Bohin and local paediatric services.
