properly done CCTV might be good for protecting from a sneak and peak keylogger being covertly installed, but that just knocks down the number of ways they can steal your encryption keys from 1,000,0000 to 999,999. You could have your house all set up with alarm systems and CCTV and have memory in encapsulation material and sit on a dead mans switch that wipes ram when the pressure is off of it and have a chassis with intrusion detection that wipes RAM when the case is opened and use an on screen keyboard and always work out of your basement with a laptop running off of battery in the hopes that it will shield adequately from a TEMPEST attack. That will make stealing your passphrase pretty difficult, but would be much more beneficial if you were hiding a bunch of CP versus trying to hide the fact that you are selling drugs.