The Defendant in the Case of United States V

The defendant in the case of United States v. Delatorre was convicted of drug-trafficking offenses. On appeal, one of the defendants claimed that the district court abused its discretion in allowing a DEA officer to testify as an expert witness with expertise on Mexican drug dealers. The court decided that:

A) law enforcement officers may not testify as expert witnesses because they lack specific training.
B) the testimony of expert witnesses is not subject to review by a court of appeals.
C) the expert testimony of a law enforcement officer is admissible if the officer is qualified and the testimony will assist the trier of fact to understand the evidence or to determine a fact in issue.
D) testimony as both an eyewitness and an expert is not permissible.