A 17-year-old man was arrested after officers raided a flat in Huntingdon at the weekend.
On Saturday, the police's southern impact team raided the flat, in Ermine Street, which was believed to be linked to the supply of drugs.
After using a ladder to climb into a window, officers arrested a suspected 'county lines' dealer, and found a class A drugs and money.
A spokesman for Cambridgeshire police said: "A 17-year-old from Northamptonshire was arrested on suspicion of being concerned in supplying a controlled drug.
"He was arrested at about 3. He has since been released under investigation."
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