Maryland health officials told state lawmakers yesterday that they were taking steps to minimize possible abuse of the addiction treatment buprenorphine as they spend millions to expand its availability. While insisting that misuse is currently not a serious problem, they outlined precautions in an appearance before a House of Delegates committee. These include screening for buprenorphine in overdose deaths, coordinating with police to monitor street sales and supporting a bill that would call for monitoring prescription drugs, including buprenorphine.