A biology teacher at Meridian's Centennial High School accused of child molestation and statutory rape had his bail increased Monday despite a motion to lower it.

Daniel Douglas Campbell was charged in a grand jury indictment with lewd and lascivious conduct with a minor involving a then-14-year-old girl and statutory rape of a 17-year-old. His attorney, Fred Frahm of Boise, argued Monday in 4th District Court to reduce his client's bail down from $100,000.But Administrative Judge Gerald Schroeder instead raised it to $150,000. Investigators cite an expanding criminal case against the former New York educator.

Campbell also was arraigned Monday on two new charges of lewd and lascivious conduct involving a 14-year-old girl, the third alleged victim who was then a student at Lowell Scott Middle School in Meridian. He is accused of twice having sexual intercourse with her.

Frahm focused on Campbell's close relatives and his 14-year roots in the Treasure Valley, but the judge raised the bail to $150,000. A preliminary hearing was scheduled for May 21.

Authorities say 50 Ada County girls or more could be involved in the investigation. And more charges may be forthcoming, Ada County Deputy Prosecutor Julianne Meehan said.

"But at some point, I think we have to say that's enough," Meehan said. Campbell faces a life prison term if convicted on any of the counts.

In the cases considered by the grand jury, Campbell allegedly impregnated the girls and then posed as their father in arranging for abortions at a Boise-area clinic.