I don't get the sense we have any standards for actually vetting the blood that's donated, which is deeply concerning

We do test the blood, but they also do coarse grained screenings like this to avoid some level of waste on intake.

We do test the blood, but they also do coarse grained screenings like this to avoid some level of waste on intake. It's like having client and server side validation.

We do, they are just not cheap enough to do on individual donations so you have to throw away a big batch every time they catch something.