Basic gear should always be designed for what kind of situations you expect to encounter.
Perhaps completely baffling to Americans, some police forces in the world dontdon't carry guns at all and will have rules ("only when you expect to need one") or seperateseparate forces that deal with firearm policing. This puts emphasis on de-escalating violence and only using it as a last resort.
If your human police is expected to regularly interact with Gnolls that arentaren't violent to authorities then they'll not need violent lethal weapons to pacify them. Through talking and social capabilities designed to interact with Gnolls you could achieve most of your goals.
So what if it does turn violent? Assuming Gnolls have a higher sense of smell then, the threat of pepperspraypepper-spray can be a massive deterrent for attack, if not stop an ongoing attack if you do use it. Other options are force multipliers like a weapon stick as well as basic armor designed to stop slashing attacks. Hell, you could put a layer of pepperspraypepper-spray or similar in the armor which releases when something rips into it, like a Gnoll biting down.