Published: Oct 21, 2010 4:16 PM EDT
Updated: Oct 21, 2010 1:17 PM EDT

MIAMI (AP) - A U.S. senator is asking federal officials to investigate after reviewing data that shows doctors across the country prescribing alarmingly high rates of powerful high mental health drugs paid by Medicare and Medicaid.

Republican Sen. Charles Grassley of Iowa studied Medicare and Medicaid prescription rates from doctors around the country, revealing few consequences for doctors with alarming prescription rates. The findings include a Miami doctor who wrote nearly 97,000 prescriptions for mental health drugs to Medicaid patients over 18 months and an Ohio physician who wrote roughly 102,000 prescriptions in two years.

The federal government doesn't investigate doctors who prescribe suspiciously high rates of drugs for fraud, but only refers them for medical review or education.