Pennsylvania Attorney General LeRoy Zimmerman has closed his books, with a slam, on the case of the pep pills and the Philadelphia Phillies.

A district justice in February dismissed charges against the doctor and two other men alleged to have improperly prescribed and delivered amphetamines to several prominent members of the world champions to-be, but Zimmerman took until yesterday to call a press conference and declare, "No purpose would be served by refiling any of the charges, or by pressing charges against the Phillies."

Slam? Besides recommending that the state medical board discipline Dr. Patrick Mazza, Zimmerman said yesterday: "Unfortunately and regrettably there is nothing in the law in Pennsylvania to make what the Phillies did a crime. Although it may be unethical, improper, a lack of candor, a lack of cooperativeness (and) deplorable, there is no criminal violation of the perjury statute" . . .

Drugs. A fellow who checked in four weeks earlier as "Irvin Houston" checked out Tuesday after group therapy at a Scottsdale, Ariz., clinic -- and, it seems, really was receiver Cliff Branch of the champion Oakland Raiders. Said Coach Tom Flores: "These things happen in life sometimes; the important thing is that the man is big enough to help himself" . . .

Scotty Bowman, who coached Montreal to four successive Stanley Cups then left for Buffalo because he wanted to general-manage, resumes his 1979-80 dual role. Replacement for Roger Neilson, Sabres' long-gone 1980-81 coach: Bowman. Protege' Jim Roberts to be "associate" coach . . .

And Roland Stoltz, 26, moves from Skelleftea, Sweden, to Washington, D.C., next NHL season. "Versatile, solid, capable of playing right or left wing, very strong; key man on first-place team in Sweden's Elite Division," says G. M. Max NcNab of the Caps in announcing Stoltz's signing and that of 210-pound defenseman Tony Camazzola, 10th-round 1980 draftee, late of the Brandon Wheat kings . . . In the NBA, the Indiana Pacers, whose James Edwards is spoken for by high-rolling Cleveland, have obtained center Tom Owens from Portland, sending the Blazers a 1984 first-round pick . . .

Oh-oh. West Virginia U. officials are investigating alleged academic infractions involving some UWV athletes. Allegedly a lot of Mountaineer players piled up As in snap "health" course since discontinued . . .

Pete Rose will break Stan Musial's NL hit record with Th Man there, following the Phils until the deed is done and be among the first to shake his hand. Or will Stanley go modern with a high five?