High on the back wall of the New Jersey Poison Center in Newark, beyond a display case filled with bottles of ant killer, antifreeze and other ingredients of noteworthy cases, hangs an electronic map of the state. It displays dozens of glowing red dots. Each marks the origin of a call received over the previous 24 hours. Updates sweep down the map every 10 minutes, and the staff knows where to expect clusters based on population. "This is one way that computerization can help us pick up unexpected hotspots," says medical director Steven Marcus. "But it's no substitute for the way a person can recognize suspicious patterns."