Sometime in the near future, a doctor might be able to prescribe some medical marijuana to a patient in New Jersey. But if the Jersey patient starts using it and finds herself in one of Philadelphia's hospitals later for an extended stay, her doctors will face a newfangled predicament. "What do you do if the patient is using marijuana and has it on them? We would have to tell them to stop it and cause more pain?" asked Curtis Miyamoto, chairman of the Department of Radiation Oncology at Temple University Hospital. "We would be putting patients in a very difficult situation."