An expert may base an opinion on facts or data in the case that the expert has been made aware of or personally observed. The facts or data must be in evidence - or, in the court's discretion, be admitted in evidence later.
Mich. R. Evid. 703
An expert may base an opinion on facts or data in the case that the expert has been made aware of or personally observed. The facts or data must be in evidence - or, in the court's discretion, be admitted in evidence later.
Mich. R. Evid. 703