What type of evidence are chemical tests classified as?

Chemical tests are classified as presumptive evidence because they indicate the possibility of the presence of a substance, such as alcohol or drugs, in a person's system. These tests typically measure the concentration of a particular substance and help establish whether further investigation or testing is warranted.

While the results of a chemical test provide strong support for claims regarding sobriety or impairment, they do not serve as definitive proof on their own. Confirmation through additional methods, such as blood analysis or a combination of field sobriety tests and corroborating evidence, is often needed to conclude impairment conclusively.

The other classifications of evidence, while important in various contexts, do not accurately describe chemical tests in the same way as "presumptive" does. Thus, understanding the nature of these tests is crucial for interpreting their results accurately within the framework of sobriety assessments.