HOW CAN I TELL A PROFESSIONAL FROM AN AMATEUR?
FREQUENCY OF SWEEPS
The last issue to consider is how often should your sweeps be conducted? Corporate contracts call for monthly, bi-monthly or quarterly sweeps. A reasonable balance should be struck between what you would like and what you can afford. While every case is unique and generalities are just that, some common guidelines do emerge. You will get the most bang for your buck by going to the highest threat level (4) so nothing gets missed and lower the frequency (quarterly) to keep the cost down. Again, the value you place on privacy and information security should be the deciding factor.
TSCM.com
TSCM: Technical Surveillance Counter Measures
Threat Level Two: (LOW CORPORATE)
Threat Level Three: (MEDIUM CORPORATE)
How Can I Tell A Professional From An Amateur?
How to Choose the Right Professional