[per loin]

Will a tinfoil hat (double wrapped) thwart the weapon.

[AreaMan]

Will a tinfoil hat (double wrapped) thwart the weapon.

Only if you use that new "non-stick" kind of aluminum foil.

[DBrow]

I assume you jest, but I'll yield a serious answer anyhow- no!

The millimeter wave heat ray can be thwarted, I think, with metal foil. But this is sound.

Your average shooting range muffs cut sound 30 db, so even with muffs on you'd hear at least 110 db, and bone conduction would go right around the muffs.