Laud humphreys conducted his research by frequenting public restrooms known as tearooms and acting as a lookout for the police. his work is considered unethical because he

misled the subjects

Explanation:

Robert Allan "Laud" Humphreys was an American sociologist born on October 16, 1930 and most noted for his research into sexual encounters between men in public bathrooms known as Tearooms. According to my research on studies conducted by Humphreys, I can say that based on the information provided within the question his work was considered unethical because he misled the subjects by not letting them know he was observing and conducting research.

I hope this answered your question. If you have any more questions feel free to ask away at .