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The U.S. Government - - specifically , the U.S. Department of Health and Human Services ( HHS ) and the U.S. Department of Agriculture ( USDA ) - - has implemented a number of measures to protect the public from health risks associated with BSE and to prevent the spread of the disease in U.S. cattle . The use of eIPV not only eliminates any theoretical risk to the vaccinee but also prevents the possibility of vaccine virus spread to immunocompromised close contacts . Other problems , particularly those involving odors , also require engineering solutions , such as capping of closed landfill cells and improved mechanisms to capture and control gas and to prevent flare outages . This suggests that D1 activation may prevent intense craving and ultimately prevent relapse . These preliminary findings suggest that activating one particular dopamine receptor may prevent drug craving and ultimately prevent drug relapse , while activating another dopamine receptor may stimulate drug craving . If the space is below the working surface , guard the entrance using a railing , barricade , or other temporary means to prevent an accidental fall through the opening and to prevent foreign objects from falling in .