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Grade 9-College. During a murder investigation, police turn their suspicion on a business partner, finding questionable receipts on his desk. Your students must determine if these receipts are legitimate business documents or evidence of a crime. To do this, students determine objective criteria for handwriting analysis, analyze the handwriting, dissolve ink, use thin-layer chromatography, create an ink profile for each sample, and determine if the same ink was used to fill out the entire form.