The behavior and actions of persons who are not well trained and conducting surveillance often appears to be

Unusual.

Explanation:

As per the given description, the behavior, conduct, or actions of the persons who are not properly trained or instructed and directing the surveillance often seem to be 'unusual' as they are unaware of the situations and necessary actions to be taken. These surveyors also lack effective communication or interactive skills due to lack of training or how to employ their workforce to get the best results or how to actually conduct the survey. Thus, it is always advised that to conduct an efficient survey a formal training becomes a must for the people who are not experienced especially or else it may seem 'unusual'.

answer; decreased;