I'm using the following command and I can still see particles:

/execute @e[type=!ArmorStand,team=] ~ ~ ~ entitydata @e[type=!ArmorStand,r=0] {NoAI:1,Health:1,ActiveEffects:[

{Id:14,Amplifier:1,Duration:100000,Ambient:1,ShowParticles:0}

],CustomNameVisible:1}

At first glance everything seems to work but upon closer inspection a particle will rise from the mob every so often.

The command is being activated by the new Repeat Command Block. It is set to Unconditional.

I have tried all variations of the Ambient/ShowParticles mix with no result. I have even tried running the command without the Ambient tag.