The Q's Trail is Not That Hard to Follow

Field scouts are getting closer to finding the current hiding spot of the Q/Gyuss tandem of evil. Ever since their respective headquarters were overrun last week they have been on the lamb, moving from one safe house to another. Normally this might make it difficult to find an adversary, but in this case our team of experts have identified evidence that makes their trail quite distinctive. We are not going to disclose what this evidence is as we don't want to tip our hand to the enemy, but the attached photo is some sort of clue for the curious.