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In each pair of twins , one had misused cocaine or amphetamines but had been drug-free for at least one year , while the other had not used drugs.The research showed that the twin with the drug history had lower scores on several tests of attention and motor skills than the other twin . The man is wearing a broad-brimmed hat , and a knee-length cloak ; the woman is shown in a distinctive bonnet with cone-shaped wings and a wide , pleated ruff . After reading the lawyer 's letter , with an interest and agitation which showed that the contents had taken him by surprise , he handed it to Arnold and his niece . The correspondence , made available by a Thai central bank official and confirmed by another government official , shows that the Fed ’ s response came not from Greenspan but from an aide , Edwin Truman . Certain commenters urged that the definition of qualified handicapped person be amended so as explicitly to place upon the employer the burden of showing that a particular mental or physical characteristic is essential .