There are many reasons and types of different surveillance techniques. Do you think your spouse is being unfaithful? Maybe you are having issues with your spouse possibly violating rules laid out by the court system in a child custody case. Do you think that a employee is taking advantage of a workers compensation case? Maybe you were involved in a collision and you think the other driver, passenger or your client is claiming false injuries.
No matter what the case surveillance is a huge tool to have at your disposal! Remember the saying "A picture is worth a thousand words". Whether its pictures or videos it's worth more than a thousand words! Also keep in mind photos and videos aren't the only surveillance tools!