* Firing an '''unsilenced''' firearm
* Firing a [[Taser]]
* Firing [[Ammunition types|Tracer]] ammunition '''even with a silencer'''
* Whenever you and at least one enemy meet on the same Side (either due to you entering theirs, or them entering yours). As a rule of thumb, melee and Stealth are incompatible, though the GM may apply exemptions to that rule if they feel it's necessary.
* Taking cover and intentionally choose not to make a stealth cover check (see [[Cover#Cover without stealth|below]])
The following '''will NOT break''' stealth; therefore you can do these and still maintain stealth:
* Firing a '''silenced''' firearm(unless also firing Tracer ammunition, which breaks stealth)
* Using a melee weapon of any kind (technically speaking - see above)
* Throwing weapons or items of any kind