Call of Duty: Modern Warfare 3 Tips

Avoiding Explosive Decoys
Aside from using SitRep, which makes decoys glow red, there are other ways to detect decoys.

An enemy care package usually takes 5 seconds to hijack. A decoy is faster and takes three.

Decoys contain high-level killstreaks, like Juggernaut, Pave Low, Assault Drone, etc.

Note that Decoys can contain killstreaks as low as the IMS, but never contain UAVs or Care Packages.