The empty frame found on the floor had fragments of colored canvas stuck to it. This painting, like all the others, as cut from its frame by what appears to be a knife with a serrated edge (like a steak knife).
Write your finding in the Lab Report #1 evidence bag label in your detective's notebook.
Lab Report #1 Evidence Bag Label:
Item Description: Empty frame with colored canvas fragments
Observations: The frame was found on the floor and had fragments of colored canvas stuck to it. The painting, like all the others, was cut from its frame by what appears to be a knife with a serrated edge (like a steak knife).
Conclusion: The empty frame with colored canvas fragments is likely related to the theft of the paintings. The use of a serrated knife to cut the paintings from their frames suggests that the thief may have had some knowledge of art and how to handle it. Further analysis is needed to determine if the canvas fragments match any of the stolen paintings.