If it will be of help, California has a definition of malicious contact:
Malicious contact is violent, avoidable contact between two opposing players. It often occurs when a runner collides with a fielder in an effort to dislodge possession of the ball. Malicious contact can also occur when a fielder unnecessarily applies a hard tag to a runner. Intent and play situation must be a consideration in determining malicious contact. Hard contact is not, in itself, malicious contact.
From what I understand, California has submitted a definition to the NFHS rules committee on numerous occasions without success.