Except as otherwise provided by Rule 5-703, a witness may not testify to a matter unless evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may, but need not, consist of the witness's own testimony.
Md. R. Evid. 5-602
This Rule is derived without substantive change from F.R.Ev. 602. Any language differences are solely for purposes of style and clarification.
Committee note: This Rule does not prevent the admission of testimony as to a witness's own age, date of birth, or other similar matters of personal history, when a requirement of first-hand knowledge cannot be met.