Frankly, I think the risk gets WAY overblown.
As was said above, if you know the person and you know they have had zero issues in their collection, then you should be fine. You should also be fine crossing the street today, or during the next lightening storm.
Now, if you do NOT really know the other person or know nothing about their collection, then I would not do it.
As with everything in life, you have to weigh the risk.
BTW, what is the proposed pairing?