Cases that are reliably witnessed or captured on film or documented with a suicide note can generally be handled by the police and the coroner or the courts, without the assistance of expert advice. In other cases, the question that needs to be answered is whether the fall was the result of an accident, suicide, or homicide. Did the victim accidently slip, trip, or overbalance, or deliberately jump or dive, or was the victim pushed or thrown? In some cases the police want to know whether a witness or a suspect has given a plausible version of the event.