From eddy -
I was told that it was to prove that the alcohol level was high enough to kill a worm , hence , the content not water…not sure ??

From dina -
eddy, this is what i heard also , anybody else hear this??

From tanveer ahmed -
the worm is nt found in tequila but in a similar spirit called mescal/mezcal it also comes from Mexico but does not follow any law like tequila were in 51% blue agave the main ingredient for making tequila is required mescal can be made from any other agave the worm has spent its entire life on the agave plant and the bottlers drop it in the bottle just as a marketing trick to compete with tequila the worm is harmless and can be eaten also