Important Clues

Once they were back in the room with the murdered gir. Detective James leaned forward, his eyes locked onto Tess's. "Actually, I do have one more piece of information," he said, his voice low and measured. "The barista who served you that morning? We've identified him as a small-time thief with a history of petty scams." Tess asked: "Do you know any more facts?" Detective James said, "I know the following: Petrov hated the person who brought a magnifying glass." "A magnifying glass was discovered near a window view of a brick wall." "The doct was seen behind jackets with tags, one jacket tagged A, and the second tagged B" "The crime lab says that leather gloves were certainly not in the waiting room" "A logic degree was used to commit the murder"

Can you solve the case

I need a hint