How do you handle it when someone on your team 'knows a better way' (that isn't documented)?

I've built SOPs for dozens of companies, and one thing I've realized is that creating the darned SOP is only half the battle. The real challenge is ensuring that people actually follow them and see to it that the SOPs stay up-to-date. Also, I like to stay relevant and see what's working, and what isn't. Are you using software?Recurring reviews? Automations? ONLY operationalizing key portions of your business? Are there structural methods (staff members or controls) in place to hedge against complacency or hard headed team members? What methods have you found effective (or ineffective) for maintaining procedural consistency across your team?