[Kotomi]

Pepper spray made from

Carolina Reaper - 1,500,000-2,200,000 SHU

Naga Viper- 1,382,118 SHU
Ghost Chilli - 1,041,427 SHU
Butch 'T' Pepper - 500,000 - 1,463,700 SHU

You can buy a lot of these peppers and juice them... 

Some people have skin reactions to ghost pepper so...

They won't open a box with spray and pepper doesn't show up on a scan and dogs aren't usually trained to go for peppers...