San Francisco Superior Court judge today denied a renewed motion to reduce the bail of a former city worker accused of tampering with San Francisco’s main computer network.Judge Kevin McCarthy heard arguments this afternoon by attorneys for Terry Childs, 44, a former Department of Technology network engineer jailed since last summer.Prosecutors have alleged Childs, of Pittsburg, rigged the city’s FiberWAN network with his own network devices and installed his own passwords which he later refused to hand over to his superiors. They said the devices could have shut down the system, which handles most of the city’s computer traffic.Childs had been in charge of implementing the new network for the city and his attorneys maintain that though he may not have followed some department protocols, he never intended to harm the system.Childs was jailed in July and has remained in custody on $5 million bail while awaiting trial. He’s charged with four felony counts of computer network tampering, as well as one count of causing losses of more than $200,000 resulting from the tampering.The Department of Technology has since said it was able to secure the system.One of Childs’ attorneys, Valerio Romano, argued today that the lack of vulnerability of the network constituted a change of circumstances that should allow bail to be lessened, or even for Childs to be released on his own recognizance.Romano told McCarthy it was “purely speculative” that Childs had any “nefarious intentions” for the computer network, and that there was no concrete evidence of an ongoing threat to the system. “There’s absolutely no evidence that he’s ever done anything negative to the network,” said Romano.Romano claimed the alleged crimes were either misdemeanors or simple infractions. “He’s simply rotting away, on a complex case, on what is ultimately … that he was hired to do a job, and he did it very well,” said Romano.McCarthy denied the bail reduction on the grounds that there were no “meaningful changed circumstances” in the case since another judge previously refused to reduce bail in October.Also today, defense attorney Richard Shikman began presenting arguments in his motion challenging the charges against Childs as not being justified under the evidence presented at his preliminary hearing.Attorneys will continue arguments on that matter June 17.