There are many potential sources of errors when designing and carrying pout experiments.
Personal error: Inaccurate observation by observers, If the data collecting has two observers and they have collected two different data which is not matching with the experiment data then it would be considered as the Observer or personal error.
Instrumental errors: If Calibration of the instruments is not carried out correctly then it will produce incorrect data then it will be categorized under Instrumental error of experiment.
Legalistic style of policing is a part of operational procedures that involves total enforcement of law to the letter with a minimal use of force but already stipulated law and consequence for a particular offence. For instance if a driver is caught going over the speed limit a ticket is issued immediately based on the law