GWENT Police have warned underaged teenagers not to use fake or altered identification to get into pubs after nine doctored passports were seized in Chepstow last week.
There have been increasing reports of young teens using fake or altered passport and driving licences or borrowing identification from older brothers and sisters for a night out.
Fake or doctored passports and driving licences seized by the police are returned to the Home Office or Driver and Vehicle Licensing Agency.
Any documents that have been used by anyone other than the legal owner is a security risk and may be destroyed.
PC Nick Hilton, licensing officer for Monmouthshire, said: ""We are working very closely with local pubs and clubs and their door staff are checking all forms of identification and can easily spot if it has been altered or is fake.
"If any form of ID is found to be fake or borrowed, it will be seized.
"The Home Office and the DVLA have also informed us that all passports and driving licences seized in this way are to be immediately returned to them.
"Any documentation that has been used by anyone other than the legal owner becomes a security risk and may be destroyed.
"If anyone is found using fake ID that they have bought, they also risk arrest.
"We are urging anyone thinking of using fake or altered ID to think twice about the consequences.
"The sight of underage drinkers in town centres can often undermine feelings of safety and that's why we are determined to crack down on this type of behaviour.
"Young people who are using altered or false ID to buy alcohol are not only having a negative impact on those around them but they are also putting themselves at risk.
"As well as the health implications, they are committing a criminal offence which could have far reaching implications on their future."