The man arrested Tuesday in the robberies of four taxicab drivers was wanted for violating the terms of his probation.

Titus Edward Medeiros, 23, was scheduled to make his initial appearance in Honolulu District Court this morning following his arrest Tuesday outside a Kapahulu apartment building. He was charged Thursday with three counts of first-degree robbery, one count of second-degree robbery and with violating the terms of his probation, and is being held in lieu of $120,000 bail.

Police believe it was Medeiros who robbed four different taxi drivers in May and June, three of them while threatening the men with a knife.

Information provided by the city prosecutor’s office showed Medeiros, who is enrolled in the Judiciary’s HOPE Probation program for high-risk offenders, violated the terms of his probation several times. Prosecutors said that although he was given additional jail time for the violations, he was allowed to serve it on weekends.

Medeiros was sentenced Jan. 24 to five years’ probation and 77 days in jail, with credit for time served, in connection with a pair of burglaries at Nanakuli High School in May 2009. At the time, Medeiros had already been in jail since November, and he was given credit for time served. He was also ordered to pay $13,500 in restitution.

Since Jan. 31, Medeiros was found to have violated probation three times, adding 66 days of jail time to his sentence — at least some of which he was allowed to serve on weekends. On June 13 a motion was made to again modify the terms of his probation, and a bench warrant was issued for his arrest, prosecutors said.

City Prosecutor Keith Kaneshiro declined to comment Thursday on the case.

Marsha Kitagawa, spokeswoman for the Judiciary, defended the program.

"HOPE has offenders who are at the highest risk for violating the terms of probation or committing new crimes," she said. "You have to expect that there will be some that re-offend. But the good news is that offenders in HOPE are more closely supervised so are less likely to commit new crimes than those on regular probation."