Which progressive era muckraker’s book led to the passage of the meat inspections act?

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.