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The color axis is in standard deviations , which is related to the statistical significance of the observed excess . Most Center staff members work in the Center 's headquarters in Washington , D.C. Shocking disclosures of insanitary conditions in meat-packing plants , the use of poisonous preservatives and dyes in foods , and cure-all claims for worthless and dangerous patent medicines were the major problems leading to the enactment of these laws . The agency also runs the Engineering and Analytical Center at Winchester , Massachusetts , which tests medical devices , radiation-emitting products , and radioactive drugs . The scale on the right is in standard deviations , which is related to the statistical significance of the deficit . Research within the division explores the causes and pathophysiological processes underlying a number of neurological diseases , including stroke , epilepsy , traumatic brain injury and Alzheimer ’ s disease . EAA and other aviation organizations jointly oppose federal legislation that would ban general aviation flights within three miles of large public events and open-air assemblies , claiming the proposal is based on economics instead of security reasons .