Black widow spider in bag of grapes.

Black widow spiders found a man in my bag of grapes bought from the Brighton, the Boston while he is out of the bag, it's black grapes fall to the ground and ran away. I do find it to be a black widow spider venom is very strong. I do the yogurt cups and immediately took it to the store where purchased. When the owner realized he ordered all the grapes from the vineyards of California, described as a black widow spider is not real. The cleaning process as well, and it is unlikely that the spider comes out of it. But if I was going to be very difficult to detect.