NORMAN — A recently retired Baylor College of Medicine professor defended several controversial studies that reported quality of life improvements and low addiction rates among certain opioid patient populations Tuesday as testimony resumed in the state’s public nuisance case against Johnson & Johnson and its subsidiaries.

Testifying as a witness for Johnson & Johnson, Richard De La Garza defended the academic rigor of several studies that the drug company’s marketing team had used in promotional materials that were harshly criticized by the federal Food and Drug Administration in a 2004 warning letter.

De La Garza testified he thought the studies headed by Milligan, Allan and Simpson were scientifically conducted and adequately supported the conclusions that they reached.

However, weaknesses of those studies were quickly brought to De La Garza’s attention during vigorous cross-examination by Reggie Whitten, one of the state’s outside attorneys.

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