A good training film that makes some good points, was really turned off at the very beginning when the narrator stated "The search was suspended by darkness" -- an absolute sign of an improperly managed search (and this was true back in 1963, as well). Searching at night just means you have really goo, dependable light sources.
As always, it depends. These days there is a lot of emphasis on intelligently managing risk to rescuers. When deciding whether or not to search at night, some questions to ask are:
1. Are we searching for a live person, or is this a body recovery?
2. How effectively can we search at night? Even with good lights, one is more likely to miss important clues at night, such as foot prints.
3. How much additional risk to searchers does nighttime bring? Depends on the terrain.
In some cases, the answers to these and other questions might be such that it makes more sense to stop searching at sundown and start again in the morning. In other cases, it might make perfect sense to search all night long.
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