Just as how airport scanners can detect drugs, they can easily detect mace and pepper spray as well.
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So it is important to remember that all liquid, aerosol and gel items must be stored in containers 3.4 ounce or smaller. All of the 3.4 ounce containers must fit in a sealed 1-quart, clear plastic, zip-top bag, and only one plastic zip-top bag is permitted per passenger inside carry-on baggage.
Corrosives such as acids, alkalis, mercury and wet cell batteries and apparatus containing mercury. Explosives, munitions, fireworks and flares, ammunition including blank cartridges, handguns, fire works, pistol caps.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.