Bat Goddess, Canadian Blood Services (CBS) are very wary of liability after a "tainted blood inquiry" in the 1990s found the procedures followed by the Canadian blood system and the Red Cross wanting; in fact, the Red Cross got out of the blood bank business entirely and handed it off to the newly-established CBS.

I learned of their fear of being sued when I ran blood donor clinics at Canadian Forces Base Chatham. Besides organizing the show and drumming up donors, I also gave blood. A few weeks after what turned out to be my last donation, I received a letter from them saying that, since my donation had produced a _false_ positive result, they could no longer use my blood.

Like Charmion, I have run into the age stop, so it's moot now in my case, too.