Based on the context and the answer, generate a question. 

Context: Another cop car pulled in behind us . I got out and was told to wait a minute for someone to take my statement . A minute or two later , a sheriff came and took my statement about what we witnessed . Chad saw an officer make the drive walk the line , which Chad reports she did very well , considering how she was driving .

Answer:

They view them as a witness .



Why is the cop so interested in the narrator ?