Published: Aug 02, 2011 5:19 PM EDT
Updated: Aug 02, 2011 4:19 PM EDT

MIAMI (AP) - A doctor testifying for a Death Row inmate says Florida's planned use of a new lethal injection drug could cause extreme pain in executions.
Dr. David Waisel testified Tuesday that pentobarbital hasn't been sufficiently tested to ensure an inmate is unconscious before deadly drugs are administered. States are using the new drug because the previous well-tested drug is unavailable.
Florida Supreme Court ordered Tuesday's hearing in the case of 61-year-old Manuel Valle. He was convicted in the 1978 shooting death of Coral Gables Police Officer Louis Pena.
Valle's scheduled execution was stayed for a month to allow arguments over Florida's plan to use pentobarbital. The drug has been used in other states but never in Florida.
Circuit Judge Jacqueline Hogan Scola must rule on Valle's execution challenge by Friday.

(Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)