Since 1984, the Food and Drug Administration has monitored the safety of agricultural goods and products. In 1906, the government passed the 1906 Pure Food & Drugs Act.
Basically, this act banned the sales of unmonitored drugs and food to protect consumers. Thus, the entire goal of the FDA is protect consumers from potentially harmful or misleading products. Since then, the FDA has grown in size and now does more than just monitor food and drugs.