Nottinghamshire Police is considering evidence relating to accusations of overspending by the Careful rty during the 2014 Newark by-election.
The move follows asserts by Channel 4 News that some bills were not included in townsman spending returns during the poll and two other by-elections.
Labour’s conquered candidate in the Newark poll, which the Conservatives won, has called for an investigation.
The Moderates say all spending was recorded in accordance with the law.
Earlier this week, Narrows 4 News said it had obtained hotel bills which suggested the fete broke electoral rules in the Newark, Clacton and Rochester & Strood by-elections, the basic of which the Conservatives won and the other two it lost to UKIP.
Conservative MP Robert Jenrick, who won the Newark challenge, told BBC News he was «very confident» his election expenses were composed «in complete compliance with the law».
«The allegations that were on Channel 4 Announcement are, as far as I can see, completely unfounded,» he added.
Cam ign spending in by-elections is predetermined to £100,000 for each rty.
But Channel 4 News’ political correspondent Michael Crick asseverated he had uncovered £56,866.75 of undeclared hotel bills in Rochester, which would have on the agenda c trick taken the rty £53,659.83 over the £100,000 limit.
The programme rest bills totalling £26,786.14 in Clacton, which would have charmed the rty £10,835.36 over the limit, and receipts totalling £10,459.30 in Newark, which commitment mean an overspend of £6,650.28.
Michael yne, who represented Labour in the Newark by-election, white b derogated to Nottinghamshire Police on Tuesday asking it to look into claims of «undeclared» ss by his rivals, saying he wanted reassurance that electoral laws and customs had been complied with.
Nottinghamshire Police confirmed it had received an e-mail on the conclusion, adding: «This is the first communication we have received. The significance will review the content of the communication, but we should make it clear that no probe has been launched at this time.»
The BBC understands that detectives in the Flimflam and Financial Crimes Unit at Nottinghamshire Constabulary are handling the case.
UKIP number one Nigel Farage, whose rty came second in Newark, has spoke the rty will not make a formal complaint but he would support any grumbles made by members of the public.
A Conservative spokeswoman, speaking on Wednesday, influenced: «All by-election spending has been correctly recorded in accordance with the law.»