An association football (soccer) match is presided over by a referee, whom the Laws of the Game give full authority to enforce the Laws of the Game in connection with the match to which he has been appointed (Law 5). The referee is oftentimes assisted by two assistant referees, and sometimes by a fourth official.
Barfoed's test. Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu2O), which forms a brick-red precipitate.
The CAGE test is a straightforward alcoholism screening test, used by many professionals in the alcohol addiction field that simplifies the process of identifying those with alcohol issues. It is the most used and respected of the alcoholism tests. The CAGE questionnaire is often used by general practitioners and family doctors as a screening tool for signs of alcoholism. Although a very short and simple test it is very effective in identifying individuals who are drinking alcoholically. The cage questionnaire is said to have an accuracy rate of 93%.