Spray drift is not a new concept. The offsite movement of pesticides during application has been occurring since we began spraying pesticides some 50 years ago. Today’s heightened concern over spray drift is a culmination of several factors. Infringing housing development, contamination of neighboring crops with illegal pesticide residues, increased use of “non-selective” herbicides on gmo crops, and a more litigious society have all placed increased demands for caution and safety on today’s pesticide applicators.