Hermia , Daisy and I had taken Pickering home to DUMBO and were on our way to Hermia 's house , a straight shot down Hicks Street . Police tape barred our entrance at Clark and the cop asked me for I.D. when I told him I lived here . I offered him plastic bags and Milk Bones and he let me pass with the warning I should n't come out again .

Question: Why did the police give them a warning ?
Answer: They had caught them trespassing the area .They had caught them doing something illegal .They needed people to stay out of the crime scene .They were investigating a crime at their home .