Judges routinely admit expert testimony offered by prosecutors, but frequently exclude expert testimony offered by the defense. A review of federal criminal court cases reveals that 92% of prosecution experts survive defense challenges, while only 33% of defense experts survive challenges by federal prosecutors A recent study of federal appellate criminal cases found that more than 95% of prosecutors' experts are admitted at trial, while fewer than 8% of defense experts are allowed to testify.'
Joelle A. Moreno,
What Happens When Dirty Harry Becomes an [Expert] Witness for the Prosecution?
, 79 Tul. L. Rev. 1
Available at: http://ecollections.law.fiu.edu/faculty_publications/36