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Check the case of Roy Walter Holtsclaw. In that case, drunken Roy Holtzclaw came home to his trailer, slapped his wife, and then shot the wall and into the baby's room. He was convicted of Florida Statute § 790.19 for shooting inside a dwelling. See more at 542 So.2d 437(1989). Other than the severity of it, I don't see how this case is any different from Chapman's.
The trick to defending Chapman, would be to argue that he didn't wantonly or maliciously fire his gun in his garage. Holtsclaw shot with intent to terrify his wife. This satisfies the wanoton and malicious element. Chapman may have just been blowing off steam.