Someone took a bite out of Harrison’s cheese sandwich! Who was this nefarious nabber? To find out, Harrison brings in a detective and a forensics expert to collect fingerprints, DNA evidence, and other clues. “What clues do detectives need to figure out a crime?” How reliable is eyewitness testimony? To find out, challengers watch a video of a “crime,” and then Harrison and the detective quiz them about how much they remember. Harrison visits the world’s cutest crime fighters: police dogs! To test how they can sniff out a criminal, Harrison hides while the dogs follow their noses to find him.