Police announced on Monday that they questioned an Israeli prison guard under caution on Sunday on suspicion of drug trafficking, bribery, fraud and breach of trust.
The 26-year-old prison guard, whose name and place of work are under gag order, allegedly provided prisoners with drugs.
Police said they suspect him of providing drugs on several occasions to inmates in exchange for various favors, of which the police would not divulge.
At the end of the investigation the suspect was detained. Police are seeking to extend his remand in the Rishon Lezion Magistrates Court on Monday.
The investigation began from intelligence provided by the Israeli Prison Service (IPS) to the Lahav 433 investigative unit.
The Israeli Prison Service and police have carried out a series of arrests over the past years to reduce smuggling in the prison system. Prison guards have been caught smuggling cell phones to Palestinian security prisoners, who pay large sums for the phones, which help them get around the surveillance of their approved phone calls and family visits.
Ben Hartman contributed to this report