According to some experts, the process of repeatedly submitting a person to imminent execution is a form of psychological torture that should be banned. The Center for Constitutional Rights has said that “the intense strain of repeatedly coming within hours or days of execution” is torture. Citing the case of Troy Davis, who was executed in Georgia in 2011 after repeated execution dates and stays, the Center remarked, “Is there any significant difference between mock executions, long recognized as torture by the international community, and Mr. Davis’s last-minute brush with death ...?” Stuart Grassian, a psychiatrist and former Harvard Medical School professor, said that the terror of imminent executions is more difficult for someone like Warren Hill, who is mentally retarded and has had a series of execution dates, also in Georgia. Grassian said, “People with mental retardation struggle with the ability to think abstractly. They have very powerful feelings but because they have fewer cognitive strengths they are less able to manage those feelings than others are.” Hill came within hours of execution four times. At one time, he ate his last meal and said his goodbyes before his execution was stayed, ninety minutes before the scheduled time. More recently, Hill was already sedated and strapped to the gurney when his execution was stopped with just minutes to spare.