We've exhausted this subject extensively before numerous times here. [/QUOTE}
NO topic is ever exhausted on NES!
I challenge you to walk into BU Medical School from BMC!!! I've been there on business (serving legal papers) and escorted by a BU Police Lt. He had to use his all-access cardkey about 8 or 9 times to get me into the building I was headed to. No way in hell you wander in there "accidentally" from the hospital.
It used to be fairly simple, but I haven't done it in years. There were signs posted that warned people that they were leaving one and entering the other. Different police forces (security in the hospital, BUPD in the medical school), but it wasn't hard to walk from one to the other. I probably used my ID, but it was so automatic that I can't say for sure.