Forensic scientists are often employed by police forces or other government bodies which have constant liaison with the police. These scientists can make errors, and prosecuting and defense attorneys must learn to explore the validity of forensic opinions and conclusions. Forensic opinions must be compared with other scientific evidence and also with evidence from eyewitnesses. Lawyers must be able to present or challenge forensic evidence, and they must understand the particular aspect of forensic science involved. Lawyers must also be prepared to present evidence properly, and this involves conferring with experts, preparing sufficient notes to cover all evidence, explaining only when necessary, consolidating different pieces of evidence, keeping on top of a case, and using computers to their advantage. The prosecution must be willing to assist the defense in understanding forensic techniques and conclusions. The dangers posed by incorrect scientific opinion have been demonstrated by many cases in Australia, England, and Wales. A further consequence of the increasing complexity of forensic tests is that there continues to be more scope for scientific dispute than ever before with the explosion of scientific knowledge. 7 references