A landlady put up a zero-tolerance drug notice after repeatedly finding empty cocaine bags behind a toilet in her pub.
Judy Boulton taped a message for the anonymous drug user to the tiles of the men's toilets at the New Inn, in Burslem, Staffordshire.
Referring to the empty coke bags, she told the drug user to 'f*** them off', before adding 'I'm on to you', StokeonTrentLive reports.
Her decisive action comes just weeks after Judy took over the boozer with hopes of returning it to its former glory.
The notice about the cocaine said: "Whoever keeps putting empty 'coke' bags behind the toilet f*** them off. I'm on to you. Judy."
The notice was still present in the toilets on Sunday afternoon, although Judy says it has now been removed.
Now Judy has vowed to hand lifetime bans to any drinkers caught doing drugs in her pub.
She said: "We found a couple of empty bags. We do not want people doing drugs in our pub.
"I have a zero-tolerance approach to drugs. I have done all the training courses and got all the certificates.
"I do not want people taking drugs in here. That is why I am on top of it. If I catch anyone doing drugs in this pub they will be banned for life and I will assist the police in any prosecution."
Judy has managed a host of pubs across Stoke in the last 12 years.
Speaking to StokeonTrentLive in December, she said: "The New Inn has been run by several people in the last couple of years. The regulars do not know if they are coming or going.
"I have had my licence for 12 years and worked in bars for 30 years. I am hoping to be here for a while.
"We get a mixed crowd in here, the young lads and the older ones. I am excited about being in Burslem for the first time."
It comes after the Mirror revealed how Britain is now the biggest market place in Europe for secret online cocaine dealing.
The country also accounts for a third of the £733million worth of the drug sold each year worldwide on the dark web.
And the National Crime Agency estimates a huge chunk of the UK’s £244million cocaine industry conducted on the internet’s sinister underworld is bought by users here.
More and more tech-savvy children and teenagers are being drawn into the dark web’s world because it offers them a “Harry Potter style invisibility cloak” in their search for drugs.
This week the NCA confirmed there were “more customers for cocaine in the UK so more is supplied”.
And the biggest dealers in Britain can rake in up to £80million a year, shipping cocaine to buyers Amazon-style – with same-day deliveries from dark web shopping sites hidden from mainstream internet users.