The big pharma of the US breaking business ethics?

The United States pharmaceutical industry is one of the biggest ones in the world with almost 21 billion dollars just in the American markets. And the way it has achieved this is somewhat debatable so as to it is valid or ethical in the business.
US pharmaceutical firms are luring Mexican residents across the border to sell their blood for up to $400 a month which is unethical on a human level. The Mexican blood donors are using tourist....