TS and MF

I've gotten several conflicting answers about wheter or not if you kill with TS that MF is not taken into account. Some reputable (in my opinion) individuals claim they have done testing and that MF is indeed taken into account. Is there any official posting/listing of an answer to this question, or is all this just heresay. It would obviously speed up runs if you could use TS, but I don't want to suffer a penalty on my MF.

Thanks for any info you can provide.