A doorman has been found working illegally in Maidenhead.
He was caught during spot checks in the borough on Friday.
They 24-year-old from Maidenhead was found breaking the law by working without a Security Industry Authority (SIA) licence.
He was cautioned by police on the night and further investigations are now being carried out into his breach of the law.
A Thames Valley Police spokeswoman said it would not name the venue he was working at as it may lead to his identification and it did not name people unless they were charged.
Police, SIA staff and Royal Borough officers carried out checks at 10 venues and inspected 20 door supervisors. Seventeen were found to be properly licensed.
Warnings were issued to two other door supervisors for breaching their licence conditions.
Cllr Phill Bicknell, cabinet member with responsibility for licensing, said: "Doormen play a crucial role in the night time economy and can make a difference to how safe customers are when using the bars and clubs around the area.
"It is vital they are checked regularly to ensure that they are licensed and are properly qualified to do the job."
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