There has never been a documented case of microshock. A U.S. Senate inquiry in the early 1970s, sparked by exaggerated reports of thousands of U.S hospital patients dying of microshock, heard expert testimony about the effect. A review of the evidence in the early 2000s found that not a single case had been reported in the 30 years since the Senate inquiry. Regular checks of the FDA's MAUDE database also show no evidence of this risk being manifest, before or since the review.