Normally a witness can only be asked about what they know about an event; that is what they themselves directly saw or heard. Only a properly qualified [[expert witness]] may be asked their opinion about their evidence, or to draw an inference from the available facts. | Normally a witness can only be asked about what they know about an event; that is what they themselves directly saw or heard. Only a properly qualified [[expert witness]] may be asked their opinion about their evidence, or to draw an inference from the available facts. |