So if sample passes the two you mentioned then it will never get sent to another lab correct?
If the urine sample passes both the integrity check and the drug check, the test is over as a "pass" and youre home free.

The above you mention are most likely done where sample collected?
That depends. In some situations, the integrity check is done at the site of collection while other times it is performed at the lab the sample was sent to.

Despite what youve read, not all U/As have an instant test done at the collection facility. Many collection facilities are authorized to only collect samples and not conduct any analysis. Therefore, the sample is sent off to a lab to where the initial and confirmatory tests for both integrity and drug panels are performed.