No experts who examined the spore pictures actually SAW any additives.
There is no principle to silica coatings.
Anthrax spores don't clump.
It's a near certainty that a child wrote the letters.
“We have cordoned off all New Jersey playgrounds and are asking all First Graders to show us their best block printing. It was very regrettable that intelligence about the Catholic “R” was revealed because now some youngster may be able to spoof his handwriting and avoid this telltale signature. We are leaving no stone unturned and are vigorously pursuing all leads and all #2 lead pencils. Some children may be prosecuted for spitwads for lack of clear proof that they wrote the anthrax letter. At the same time, we have two dozen agents scouring letters to Santa in hopes of a break as we did when we pursued the “Nathan R” lead in the UNABOM case.”