15w34d: Can still see particles when ShowParticles:0

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 it seems to work but every so often a particle will rise from the mob.