Help needed passing Emissions!

Here is my story....1994 Dodge Ran 2500 5.9 with 330,000 on it.....every year I smog it I added a 50/50 mixture of e85 and regular gas....making sure the tank is near empty....every year it passes.....last year....i did not add the e85 to the tank and it failed the smog test.......I told the smog tech i would be back in a hour for a retest...drove down the gas station...added 5 gallons of e85 to the existing gas in the tank....drove around for 15 minutes to ensure the new mixture of fuel was getting to the engine....back to the smog station...hooked it up ....passed with no problem.....smog tech asked me what i did....told him.....went and added more gas to tank to dilute the mixture....

the sniffer will not see the e85 that is being burned...

been doing that for a number of years...