Yep, if I remember correctly, Andrew Brietbart’s toxicology report took about six weeks. An autopsy report without toxicology results is incomplete.
“The Truth About Toxicology Tests”
Facts about ‘real-life’ toxicology tests you won’t learn from watching television crime shows.
In real life, toxicology test results take much longer.
“Some of the tests take days, weeks, months,” says Alan Hall, MD, a board-certified toxicologist and consultant in Laramie, Wyo. The final toxicology report, he says, draws not only from multiple test results and confirmation of the results, but also on the clinical experience of the toxicologists and pathologists involved in the investigation, as well as field work.
Here is what toxicology tests include, why they take so long, and why they can be tricky. [excerpt]
http://www.webmd.com/mental-health/alcohol-abuse/features/the-truth-about-toxicology-tests
I'm not sure I'd use Brietbart as an example of how a post mortum should be performed. Although the results in this case should be the same.