A recent report by Consumer Reports on imported shrimp:
http://www.consumerreports.org/cro/magazine/2015/06/shrimp-safety/index.htm has brought the safety of imported shrimp back into the news.
Some facts to consider:
Over 90% over shrimp consumed in the United States is imported.
5% of imported, raw, farmed shrimp recently tested positive for antibiotic residues. (see articles linked below)
The FDA is responsible for inspecting shrimp coming into the U.S. to make sure it doesn't contain any drugs or chemicals not permitted.
The FDA examined less than 4 % and tested less than 1% of imported shrimp coming into the country last year.