An informal bouncer, a friend, an off-duty acquaintance, or someone found through classifieds, can seem like the cheap option, but it usually comes with no background check, no documented training, and no insurance behind them if a fake ID slips through or an ejection goes wrong. Booking bar security through Calvis matches you with licensed local agencies instead, so every bouncer on your door is background-checked, trained in ID verification and de-escalation, and covered by their agency's licensing and insurance. It is the same door coverage bars actually need, just accountable and professional instead of informal.