That is not completely accurate. The chart that I showed where we overlaid the times to collect blood versus the decline in THC levels in blood is for cases of crashes where the mean time between the incident and collecting the blood was about two hours. However, for proactive cases where a policeman simply makes a traffic stop, the mean time is about one hour. So, you have a greater chance of getting caught, in your terms, at a proactive stop than you do in cases where somebody has been killed or injured.
We've also had data showing that in rural counties—to answer another member's question—the time to collect blood is longer, as one might expect, because you're just further from the place where you can take a blood sample.