How about strict rules for both getting checked out if in ANY miinisterial or church role (any publisher-pioneer-MS-Elder-etc) and mandatory reporting (no clerical privileges to anyone catholic or JW in any role). THose should be laws regardless of non profit status or not. FURTHERMORE, they LOSE non profit status if they do not comply with those requirements while providing evidence of the checks and a written statement, signed by the highest authority in the organization nationally, that they are in compliance with this law and have provided training as regards the mandatory reporting. There should be a severe penalty for falsifying such records as well as being open to all kinds of litigation if they do not.
This is a push and shove into decency, but most JWs can comply and those that can't will not be counted as publishers or allowed to go door to door and other JWs will know it. They should also have strict guidelines in place to educate parents in any group that has had the tendency (like the JWs) to previously DISCOURAGE individuals/families from reporting to (real) authorities. That one needs to be hammered in because of the WT propensity for discouraging it, whether directly or in their sneaky little ways.