good questions, David I can only assume that although we've been told it's fairly easy for spirits to interfere with electric/electronic devices in our physical world there must be something constraining inappropriate behavior. Just imagine the chaos it could cause if malicious/mischievous spirits could interfere with important elctronic circuits. There's already great concern about foreign governments interfering in elections, exercising political influence etc. by manipulating the cyber systems found throughout our modern-day world. Just imagine what might happen if our friends unseen were also able to interfere.