The government has admitted to "serious errors" which led to two people dying after a number of convicted drink drivers were wrongly given their licences back.
The fatalities occurred in 1996 and 2006 after two convicted offenders did not complete medical checks before getting their licences back.
Overall errors within the DVLA led to nearly 4,000 drivers getting their licences back without completing the proper tests. Over 25,000 records are still being checked manually to find if any other drivers have slipped through medical checks.
The government has said they will contact them to undergo medical assessments "immediately".
Transport minister Mike Penning revealed the error in a written ministerial statement: "It is with great regret that I inform the House that we have identified two cases in 1996 and 2006 where a driver who was issued a licence without first proving their medical fitness to drive has subsequently caused death while driving under the influence of alcohol.
"Every death on the road is a tragedy and we have the deepest sympathy for anyone affected by the actions of these drink-drivers. It is not possible to say whether the drivers in these cases would have got their licences back following a medical examination."
In response shadow transport minister John Woodcock called for the government to be clearer "on how urgently it is dealing with drivers who should not have been allowed back on the road".
"Ministers should state how long they expect it will take to re-assess the 3,895 high risk offenders already identified as being wrongly reissued a license, and how long it will take to go through the remaining backlog of unidentified cases.
“Ministers must complete a full review of these records as quickly and thoroughly as possible to make sure that dangerous drivers are not on our roads", he said in a statement on Thursday.