Which type of evidence includes drug test results?

The correct answer pertains to the category of evidence known as documentary evidence. This type encompasses any documents or records that are presented as evidence in a court of law, including reports, letters, certificates, and test results. Drug test results are classified under this category because they are written records generated from a formal testing process. They serve as objective data that can substantiate claims related to substance use or abuse.

Other options, such as topological evidence, are not recognized categories of evidence within legal contexts. Electronic evidence pertains to data stored or transmitted in digital form, which does not apply specifically to drug test results, as these results are typically provided in hard copy or documented formats rather than as electronic files per se. Testimonial evidence involves statements made by witnesses under oath, which is distinct from the objective, documented nature of drug test results.