What test do Japanese police use to determine the degree of intoxication?

The correct answer is the Kitagawa Balloon Test, as it is specifically recognized in Japan for assessing levels of intoxication. This method not only measures the presence of alcohol but also infers the level of intoxication based on the amount of air a suspect can blow into the balloon. The amount of alcohol in the air correlates with blood alcohol content levels, allowing officers to gauge whether a driver is under the influence.

In contrast, other methods like the Breathalyzer Test or Blood Alcohol Content (BAC) Test, while common in various other countries, are not the standard protocols used by Japanese police. The Alcohol Sensing Test could also refer to a general method, but it does not specify a unique or recognized approach like the Kitagawa Balloon Test, which is tailored to the Japanese context and legal framework. By understanding this, it becomes clear how the Kitagawa Balloon Test plays a significant role in Japan's approach to managing intoxicated driving.