Final answer:
Michael Carneal stole the guns and materials used in the shooting at Heath High from his father's collection without his knowledge.
Step-by-step explanation:
Michael Carneal obtained the guns and materials used in the shooting at Heath High by stealing them from his home. According to reports, Carneal took the firearms from his father's collection without his knowledge.
This incident highlighted the issue of access to firearms and raised concerns about gun control. It is important to address mental health problems and ensure that guns are stored securely to prevent tragedies like this.