I want you to discuss one threat to casual validity of a specific experiment. There is no need to search for an example of an experiment. Instead, you should use what we’ve already discussed The Kansas City Preventative Patrol Experiment. You should discuss one possible threat to causal validity that could have potentially impacted the results. You should make sure to discuss the exact way this threat could have affected the results of the experiment. Here are some additional questions you may want to consider:

Were the researchers aware of this threat?
How did they try to deal with this threat?
Is there any additional steps that could have been taken to avoid this threat
Your initial post should be between 200 and 300 words