Chemicals are often used for control of invasive weeds and brush that hamper revegetation efforts on rangelands. Agricultural herbicides undergo extensive toxicological, environmental, plant efficacy, and cost-benefit tests before being released for widespread use. This database of knowledge enables the applicator to select herbicides to fit the targeted weeds and brush for maximum efficacy, efficiency, safety, and economics. The major change in application practice has been a shift from broad-scale aerial applications to individual plant treatments with ground equipment. In either case, the application equipment has been designed for more precision and safer use. Global positioning systems (GPS) and geographic information systems (GIS) on aircraft or ground units allow the operator to "sculpt" the landscape for multiple land-uses, e.g. wildlife habitat, grazing, water harvesting, and aesthetics. Herbicides will continue to play a significant role both singly and in combination with fire and mechanical treatments in revegetation projects. Persons applying restricted-use pesticides must have state certified Applicator's License and follow specifications on the chemical's Product Label. It is important to note that the Directions for Use section of all pesticide product labels begin with the statement: "It is a violation of Federal law to use this product in a manner inconsistent with its labeling."