I didn't understand part of the plot to Touch of Evil (1958)

I feel it was really far fetched how the villain, Quinlan, was able to frame Vargas's wife for murder. All he did was have the woman raped and drugged and kidnapped, and then planted her at the scene of a dead body. But is that really enough evidence to hold up for framing someone for murder. Back in the 50s, if a woman is shown evidence to be kidnapped, drugged, and raped, and then planted next to a murdered body, would the court by it as a enough evidence to stick, as oppose to her just being drugged, raped, and planted there by someone else? It just seemed so flimsy, evidence wise

Another thing, why was the Janet Leigh character trying to keep her husband in the dark, near the beginning, of she talked to, but then changed her mind once she was delivered the note? Why not just be honest with her husband and tell the truth?

I feel it was really far fetched how the villain, Quinlan, was able to frame Vargas's wife for murder. All he did was have the woman raped and drugged and kidnapped, and then planted her at the scene of a dead body. But is that really enough evidence to hold up for framing someone for murder. Back in the 50s, if a woman is shown evidence to be kidnapped, drugged, and raped, and then planted next to a murdered body, would the court by it as a enough evidence to stick, as oppose to her just being drugged, raped, and planted there by someone else? It just seemed so flimsy, evidence wise

Another thing, why was the Janet Leigh character trying to keep her husband in the dark, near the beginning, of she talked to, but then changed her mind once she was delivered the note? Why not just be honest with her husband and tell the truth?