User blog comment:Woohoot/Things that totally could happen, but won't cause... Manga.../@comment-4754162-20150522040840

About that (teleportation via Ope Ope).

I am of the opinion that if the birdcage can even block radiowaves or should I say DenDenMushi waves, then it is also somewhat applicable with teleportations, those via Ope Ope, Doa Doa, etc

So no, not anything that is on the surface or air. But underneath (ground) may be something else

EDIT:

One more point to add, if indeed teleportation via Ope Ope works, Law won't be seen so stressed out when the birdcage was installed