A TEEN murder suspect flushed a knife down a police cell loo after officers failed to find the weapon following his arrest.
Cops recovered the blade from a septic tank but fear vital forensic evidence has been lost.
The blunder came days before a suspect in a separate murder case slashed his wrist in a cell.
Both incidents were at Wembley police station in North London.
Last year, Met Police Sgt Matt Ratana, 54, was shot dead at Croydon custody suite by a handcuffed suspect with a hidden gun.
In the latest case, a search of the teen after he was arrested over a knife murder failed to find anything. But cops later spotted him flushing a knife down his cell toilet.
Then last week, a 63-year-old man held over the killing of Hungarian sex worker Agnes Akom, 20, was taken to hospital after cutting his wrist with a hidden razor blade.
Scanner tech is due to be trialled at Wembley in July.
The Met’s Directorate of Professional Standards and Independent Office for Police Conduct are investigating.
A source called the two incidents “disturbing”.
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