Use of ‘about’ in Act of Testifying definition

[gregfowlerphd]

According to the definition, an AT is ‘performed by making a statement about one's personal knowledge or belief’. That doesn’t seem correct to me. When a witness testifies the suspect was home at 8 PM, their statement is about the suspect, a time, and the suspect’s whereabouts at that time but not about the witness’s personal knowledge or belief. Instead, it states the witness’s personal knowledge or belief.

I recommend modifying the AT definition as follows:

An Act of Representative Communication performed by stating one's personal knowledge or belief.