Listen to their speech carefully. Every time they say something that’s similar to a swear (especially if you can maneuver them into speaking about clASSic cars or saying “I was going to BUT …”) tell them that your profanity filter has caught them and they need to contribute to the swear jar. By the end of the conversation, flag even sentences that have no profanity and say that your profanity filter has adapted to their speech and has detected something undesirable. Even better, don’t flag sentences where they DO actually swear.
You can do this with emails as well, and the non-real-time interaction will make it easier.
Then ask them if they think the government’s filter will be any better than yours as you go out to a restaurant to eat or to get drinks (using the swear jar to finance the trip.)
