Regarding the original topic:
The Catholic church does not recognize Jehovah's Witness baptisms as being valid. That is because JW baptisms do not use the trinitarian form: baptizing "in the name of the Father, Son, and Holy Spirit" (Matthew 28:19). The church does accept most protestant baptisms, those which use the trinitarian form and wet the head with water (anything from a simple pour on the forehead to full immersion is acceptable).