Ran this by a friend in the Michigan State Police…
Wasp spray can be lethal.
It’s illegal to carry wasp spray as a “Self Defense Spray” in Michigan. If used, even in self defense, you will be charged at the least with a “misdemeanor, punishable by imprisonment for not more than 2 years, or a fine of not more than $2,000.00, or both.” or a maximum of (depending upon the circumstances) felony murder.
The only legal form of “Self Defense Spray” in Michigan is outlined by state law; THE MICHIGAN PENAL CODE (EXCERPT) Act 328 of 193, Section 750.224d:
Michigan Legislature - Section 750.224d
According to my friend, carrying wasp spray or mace as a "Self Defense Spray" can also lead to revocation of your CCW in Michigan