Farmers are trying very hard to prevent contamination from happening by preventing it at the source by increasing quality control measures.
Has it ever occurred to you that the vegetables you eat may be contaminated? There have recently been many incidents dealing with spinach contamination but the concern is not limited to spinach alone. Other affected vegetables and fruits include:
-Sweet bell pepper
-Strawberries
However there are some fruits and vegetables that are not often contaminated such as: