Does weed cause issues with speech?

Some girl came up to me while I was waiting to be called in my therapist’s office and asked me to read her drug test out for her and tell her what it means. There were a bunch of drugs which were all negative except marijuana which read positive. I told her you got positive for marijuana and she said what does positive mean and then she said “so what is better positive or negative?” I said “what do you mean? You got positive for marijuana”. Then she said “so what should I choose positive or negative?” in a monotone voice. She looked like she lacked attention too and sounded drunk but she could walk fine.

I was sooo confused when she said “what should I choose positive or negative?” Like what??? Lol. Does weed make you unable to comprehend things or understand simple things or say gibberish words and sentences that don’t make sense? Or was she likely under the influence of something else as well? I thought maybe alcohol.