What forced meat packers to open their doors to inspectors?

Answer 1

Meat packers, and everyother facility that provided the service of food: packageing, production, slaughter, developement, was the demand by the citizens for cleaner food. This demand arose from ecoli outbreaks and many other deadly diseases being transferred to the financially insecure lower classes, who could barely afford food as it was, because of impure foods. And inpure foods were cheap to make and package because there wasn't the need to clean and process the food before sending it out. Finger nails, insects, hair, blood, and other little nasties were allowed to be sent right to the consumer. Thank the government (for once :) ) for providing the Food and Drug Association.