Also you need significant training to even know what to do with professional grade equipment once you have it. Bug detection is an entire profession and it requires months to years of training and tens of thousands of dollars worth of equipment. If your attacker gets their bugging equipment from we-sell-spy-gear.info then you are probably good to go with bug detecting equipment from we-sell-bug-detecting-equipment.info , but if they are using professional grade equipment it will require professional grade equipment to detect it.