Yeah, every time you go in to donate plasma they do a little health check on you... your temp., your blood pressure, your pulse rate, white-blood and iron count and shit...] Every time I went in stoned on weed, my pulse rate would be way too high. they check it for you twice, then you can come back in 24 hours. The best way to combat this, like when you know you're stoned and you're pulse rate is gonna be jacked, is to hold you breath while they are taking it. It will dramatically lower your pulse rate.
They don't drug test but they do check the injection sites, so to do intravenous drugs you'd have to relocate to an area they aren't going to see.
And they store your plasma for a while, and do routine blood tests. This way if you're blood is found to contain something undesirable, they can pull the last couple months off the shelf they've been storing... so to speak.
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