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DNA can be collected from a few cells these days, so even if he breathed on the weeds, the possibility is there that his DNA transferred. In any case, it is ridiculous that the weeds were not even collected for a cursory examination.
LE will usually discuss and determine what they decide to collect or not. They can't collect every single item. Some items are not collected for a variety of reasons. For instance in the Delphi case investigators decided not to collect the branches at first because that type of surface is hard to test and collect DNA from.
And although I agree that LE should have taken the doormat and Lantana (in hindsight) I now believe those choices were made for a reason. The doormat - probably because of numerous DNA samples all mixed together from numerous people's shoes. And the Lantana - not an ideal source for DNA extraction.