Here is an article from the New Orleans Times-Picayune from February 19, 1973:

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His preamble about Jim Garrison
Jim Garrison asks Clay Shaw to take truth serum or a lie detector test
Shaw's friends are shocked at his arrest.
The reality of what Clay Shaw is up against starts to kick in.
Just taking a car ride can be hazardous - Shaw is not allowed
to leave New Orleans Parish without permission from Garrison's office.