There's been no formal change in Social Security's rules for determining disability due to intellectual disability or mental illness in decadess. However, look at what's happened in recent years to the number of people approved for disability benefits for these reasons:
Number Of Disability Insurance Benefits Claims Approved For Intellectual Disability
2010 -- 18,867
2011 -- 14,145
2012 -- 12,009
2013 -- 10,141
2014 -- 9,738
Number Of Disability Insurance Benefits Claims Approved For Mental Illness (Including Intellectual Disability)
2010 -- 218,862
2011 -- 191,898
2012 -- 172,995
2013 -- 145,997
2014 -- 123,676
What happened in 2010 that started this change? Could it be the fact that Republicans took control of the House of Representatives? Is that the same as a change in the statutes or regulations? What do Republicans have against the intellectually disabled? What do they have against those suffering from mental illness? And the biggest question -- why should a change in the control of Congress affect how Social Security determines disability?