Tykos 30
From Halopedia, the Halo wiki
Tykos 30 is an organic tracking devise. It has a similar appearence to the yellow liquid "Blood Plasma". One Marine described to a man injected with the substance that they "can track ya to Mars". The UNSC believed that the Covenant were not aware of its use and were unable to track the substance.[1] In reality, they could track the substance.
Sources
- ^ "We can track you. They can't" - Halo: Uprising Issue #4
