CO: TLV-EWR duty free liquor?
 

I just wanted to confirm- for CO (UA) TLV-EWR, if one wanted to buy duty free liquor in TLV, they would be faced with the secondary liquid screening right before boarding, correct? Or is there a way to get it on board in a legit fashion?

When I tried to do it they wanted to take it away. Went back to Duty Free and they allowed me an exchange...so I returned with a lot of Swiss Chocolates.

Edit after JoshWex90's post: They saw me packing it into my bag so I was stopped. If you're going to do it be sure to repack out of sight.

There is no secondary screening. When you get to the gate, they will ask you if you have liquid. If it's in your bag, where they can't see it, they won't open your bag to check - they will take your word for it. If you want to bring duty free, just tell them no. More and more, they don't even ask me anymore - they just say "no liquids allowed," and it's up to me to say "I have liquids." (Granted, I no longer bring duty free with me.)
So if you want to bring duty free liquor with you, it's quite easy. But it might not fit your criterion of "legit."

Thanks guys, that's what I was looking for.

You can find all duty free rules and regulations here... http://www.dutyfreeonarrival.com/en/search/tlv

This not only doesn't answer the OP's question, it's factually incorrect. The OP asked about carrying duty free liquids onto the plane, which isn't technically allowed, though is easy to skirt.
That site doesn't talk about that. It also claims that TLV has an arrivals duty free shop, which isn't true. The extent of inbound duty free at TLV is pickup: If you buy duty free when departing TLV and plan on returning, you can leave your purchase in Israel, and pick it up on return. The site makes no mention of that either.

When I flew on CO they just grabed my bag and opened it and started looking into it

Was there a reason for that? That's technically illegal (at TLV, only official security forces can demand to see your bag).