Fingerprints for a death!

We did an investigation of Mr.Davisons death, what we did was we took various fingerprints for the students from year 8, year 9 and year 10. The items we used were: a piece of paper, pencils and tape, so what we did was we asked the students too place their fingerprint on the line of pencil lead and then we placed their fingerprint on tape and then compared the fingerprints from the culprits. So we found out that the people that were guilty were Tamara from year 10 and Andrea from year 10.