ToaTImeLord

if you plan on making a habit out of it, if you really want to make things more difficult for the authorities use different methodologies and different dumping grounds every time. space them out over long periods of times, the more sporadic the better. it'll make it harder for them to determine whether it's one person. and for the love of god, unless you're really narcissistic, avoid taunting the police with letters and calls.

in the event you do decide to send messages to the police, don't use digital means. and if for some reason you have to, always make sure there's no metadeta or hidden files that can be traced back to you. that's such an amateur mistake, especially in the 21st century, and yet it's what brought down the BTK.

of course, I don't know any of this from experience, I'm just a psych student with an interest in true crime. if you want actual firsthand advice, I'm sure you can obtain the proper contact information to exchange letters or phone calls with certain prisoners. always ask how they got caught, though, so you can learn from their mistakes and know what to avoid.