There are no hard and fast rules on how to monitor for pests. Some institutions contract out their pest monitoring, others find they are better able to evaluate their activity by monitoring in-house. A combination of the two can also be used. The type of monitor or trap, distribution and placement will depend, in part, on whether you are trying to monitor general trends and activity, or to pinpoint the location of a specific problem.
Explore this section of the site for more information on trap selection, placement, supplies and more: