Happy New Year all!

I need to cut 3 pressure treated 4x4's into 36" lenghs for a small project I
am doing. Will the 4x4's do any special damage to my saw blades (I was going
to use my 10" sliding miter saw) or should I take them outside and use a
chain saw? I know there is arsenic in the pressure treating material so I
will wear a respirator in either case but I'm concerned about dulling my
blade.

TIA.

Dick Snyder