TWO PSNI officers selected for random drugs tests were found to have shaved every hair from their body.
This resulted in the tests, which would have indicated if they had taken drugs in the last three months, being abandoned as they rely on analysis from hair samples.
The cops, who were based at the same station in Belfast, are still with the force.
Details of the farce emerged after PSNI chiefs confirmed that 15 serving officers have tested positive for a controlled drug being in their system.
The admission was contained in a response to a Freedom of Information request by a member of the public.
However, many more have been missed including bent cop Allan Kennedy who is serving a jail sentence after pleading guilty to drug dealing while a serving officer.
The PSNI said: "Since the inception of random and intelligence-led drug testing, there have been a total of 1,475 tests. Of these tests a total of 15 indicated as 'positive' for the presence of a controlled drug."
PSNI sources who alerted Sunday Life to the issue said that drug-taking by officers is a bigger problem than the public realises.
One revealed: "I have personally overheard officers talking about their drug use while on duty, it's as common in the PSNI as it is in any other profession.
"I also know of some crazy situations involving testing. There was a round of drug testing at a station in Belfast and two officers turned up to a briefing without a single hair on their bodies.
"They had obviously been tipped off that there were drug testers waiting on them. One of those involved has a close relative who is a senior officer. The feeling is that this person forewarned them about the drug tests."
The PSNI introduced compulsory random drug testing over a decade ago. Those officers selected to take part are only supposed to find out at the last minute, but insiders say that test plans are often known days before.
"It's the intelligence-led drug tests that have turned up the positive results, not the random ones because most officers find out when they are to take place," added a source.
In its most recent internal service instruction document from 2018 the PSNI strongly warns its staff against taking drugs.
It advises: "Any individual involved in the misuse of drugs exposes themselves to vulnerability in terms of corruption, blackmail, and integrity and faces disciplinary and criminal consequences."
Internal PSNI drug testing usually involves taking a urine sample, however this only indicates whether drugs have been consumed in the previous 10 days. The hair follicle test, which is generally only used on new recruits, covers a three-month period.
In 2017 rogue cop Allan Kennedy (left), who was based at Strandtown PSNI station in Belfast, pleaded guilty to dealing drugs and being a cocaine addict while a serving officer.
He was jailed for five-and-a-half years after also confessing to trying to buy an untraceable gun on the dark web. Searches of the 34-year-old's car and home uncovered cocaine, ecstasy and cannabis.
Jailing him, a judge said: "It is accepted that you were a user of class A drugs and were supplying others in order to feed your habit. It is accepted you should be treated as a commercial supplier of drugs."