Incorrect. Moreover, you are showing a complete lack of knowledge of anthrax spore sizes. Anthrax spores are so small that they flow freely through plastic garbage bags like mosquitos flying through chain link fences do on a similar, but larger, scale.
Just more of your total nonsense. There's no way for spores to get through a plastic garbage bag. If a plastic bag can hold water, it can contain spores.
When the letters found, they were put into plastic bags for moving from the scene of the crime to the laboratories, and from one laboratory to another. They are probably inside plastic bags right now.
The idea that spores can get through plastic bags is laughably ridiculous.