Pre-cleared flights usually gate at domestic terminals and deplane direct to the terminal as any other domestic flight. For all practical purposes pre-cleared flights are considered domestic flights from a ground operations perspective. It is theoretically possible but quite unlikely that immigration officers might be waiting for one specific passenger at ...
From the TSA's website:
Duty Free Liquids: You may carry duty free liquids in secure,
tamper–evident bags, more than 3.4oz or 100 ml in your carry-on bag
if: The duty free liquids were purchased internationally and you are
traveling to the United States with a connecting flight
Just make sure you get a STEB (secure tamper evident bag) which is ...
You will almost certainly NOT have to re-clear security - although you can't definitively rule it out.
The vast, vast majority of pre-cleared flights will arrive into their US destination as if they were a "domestic" flight. ie, you will be let out into the departure area of the airport.
Depending on the airport layout you may need to re-clear security in ...
In my experience, when arriving in the US after a pre-clearance flight, you arrive in the post-security area of the terminal, and can catch a connecting flight without going through security at that airport, assuming that the gate you arrive at and the gate you will depart from are connected post-security.
Here's the relevant airport page:
International flight to U.S. flight
Canada Border Services Agency*** & U.S. Customs and Border Protection
*** Some International to U.S. connecting flights at Terminal 1 do not require passengers to clear CBSA before clearing U.S. CBP inspection.
So, you will do cross the US border in Toronto but whether ...