A major police operation on the San Diego State University campus led to the arrest of 75 students on drug charges yesterday. Fifty pounds of marijuana and four pounds of cocaine were seized in the sting, which involved seven SDSU fraternities.

The arrests were the culmination of six months of undercover work in SDSU’s frats, initiated after a 19-year-old student died of a cocaine and alcohol overdose last year. All of those arrested were men, and approximately twenty were charged with drug sales rather than possession.

On Tuesday SDSU suspended six fraternities — Lambda Chi Alpha, Phi Kappa Psi, Phi Kappa Theta, Theta Chi, Sigma Alpha Epsilon and Sigma Alpha Mu — that were implicated in the case. All of the arrested students have been suspended, and those who lived in campus housing are being evicted.