My question involves criminal law for the state of: Massachusetts
My friend has an assault & battery trial coming up. He is the defendant and his ex-wife is the victim. The prosecutor is having the ex-wife's boyfriend testify as a witness but he wasn't
present during the alleged assault. The entire thing is on surveillance because the alleged incident happened outside of a store during a custody exchange.
What could the boyfriend possibly say since he wasn't there at the time?

