When I cook raw meat, especially chicken strips, I have it spread out on the chopping board with a few bags and containers of spice to the side. I don't actually use too many shakers for spice. Since my fingers can only hold so much spice at once, I often go back to the bag and grab some more and rub it on the meat. But this is after my fingers have touched the meat. Does this contaminate the spice in the bag or container?

Also, chefs on TV shows frequently make it that way, does this mean it is a safe practice?