"But it's the world we live in," he told reporters.
That sibling, 54-year-old Roger Scott, lives in Dallas.
He has bipolar disorder, receives government benefits, and may have a history of criminal activity and drug abuse.
Gov. Scott, his big brother, signed into law May 31 a bill that requires welfare recipients to get drug tested.
Scott repeatedly refused to tell New Times whether his brother's struggles have affected his policymaking.
Scott also would not say directly whether he would drug-test his own brother.
Instead of answering these questions, his office released a noncommittal statement:
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"The governor believes that everyone who applies for welfare benefits should be drug tested."