Colour state other than clouds or low visibility (e.g. ice or other obstructions) then the word BLACK is written in full and placed immediately before the actual colour state (e.g. BLACKWHT). The colour state may be appended to a METAR report. A short period forecast called a "TREND" which covers the following two hours from the observation may also be added, often with reference to the colour state. The following criteria are used to determine the colour state: Colour state Colour states is a system used for quickly showing meteorological conditions. Meteorological colour states are determined by the relevant worst condition from
Expert witnesses in English law adduce expert evidence in aid of their defence, they must have been suffering from a genuine and recognised mental condition, which was capable of producing effects on the mind and body outside the expertise of the tribunal. Thus, in "R v Smith", a defendant to murder by stabbing was permitted to call an expert to explain the effects of automatism, which he had been suffering from. It has been made clear that in cases where individuals are merely vulnerable or easily susceptible to suggestion, expert witnesses may not be called in order to testify to such characteristics. In "R v