. This O'Fallon,Mo location was selling "previously frozen" Baby Back Ribs for 1.99 lb.and they were packaged in an open ended plastic sleeve. I had never encountered this sort of packaging before. Is this practice safe and sanitary?

I can't imagine uncooked and uncured meat being open to the air being safe. Particulates in the air from a cough etc. would invite contamination IMHO.

Why don't you call and ask?

I don't believe that's their normal practice.

Was it vacuum sealed and it just busted open? And did you let the employees know that it was open