User blog comment:Suparockr/List of Plotholes throughout the series/@comment-4953843-20120717030539/@comment-24174486-20120717032313

"I dont understand why they even used tracking kai leng as a primary source of getting to TIM, instead of just going and asking Miranda where the Station is"

Miranda states in ME2 that the Illusive Man frequently moves his base of operations. It would be unlikely that any bugs that could have been left by Miranda would go undiscovered; Mordin Solus finds several of her bugs when he comes aboard the Normandy, so it would also be likely that the Station's crew could find any bugs.