Lies?! Is my husband a cocaine user occasionally/ever?

Since we've been together I've questioned his behavior regarding cocaine. I told him I have a real problem with it (my son's father is not ijn his life or financially supportive and has been back to jail due to usage-which is scarring).  

I said "Take a test or quit lying"

His respones,"I'll take a test, and when I pass, I'll be done with this relationship."

We are married!

No bloody nose. Signs I see are flushed bags under eyes, on cheeks. Glassy eyes. Scratching other areas (not nose-maybe because I'm watching?). Spitting white or very mucousy?!

How long does the high last? What is recreational/binging?
He tattoos everything is cash.

He admits to using it before during our relationship, behind myback, when away from me?

First weekend we were married a few years back:

"What's in your pocket?"
Relunctatly, pulls out a pill bottle.
"Ok, what is it?"
"a little bit of Coke. Our roommates gf gave it to me for staying awake on our upcoming road trip."
A huge fight ensued.
I had to go show a property.
Came back., he'd done it? Didn't admit til a year after.
Says our fighting was because "Iknew he had done it."

Now today, around ld friends. He's been tattooing for hours.

He actually tasted funny Sat. @ tatttoo convention. I called him out. His friend had been up for two days, came to get tattooed. Stayed up til that evening. She took his side. Claimed I had "No proof".
He says my accusations come out of nowhere and gets pissed at me until I say I was wrong and drop it.

I know him. Spend days with him. I can tell when he's different-or am I in left field here as he says?!

Please help

[GA Guy]

Go back and read your own post...I think all your answers are in there. People that aren't addicts have no problem proving it. Addicts in recovery have no problems proving it. Addicts actively using have problem proving it. My advice...Believe everything an addict DOES.