Correct me if am wrong, as if you wouldn't otherwise, is every claimant asserting persecution of one form or another, ie a credible fear.

If so, there is no way the interrogators can keep up with the level of volume with the level of effort you describe.

Every asylum claimant is detained from when they are picked up by Border Patrol until they get their credible fear interview before a DHS officer. That's usually several days to a week. During that time, they're fingerprinted, scanned, and compared to all the databases. None of them are released until the interview.

If they fail their interview and don't have a credible fear, they're eligible for expedited removal and can be immediately deported. They'll be detained until the next removal flight back to their home country.

If they pass their interview and are found to have a credible fear, they can stay in the U.S. until a merits determination on their asylum claim. Most (but not all!) of these folks will be released, and told that they need to appear for their court date before an immigration judge. Since DHS has the legal authority to detain you indefinitely (except minors), there's no guarantee you'll get released - so if you're an Arabic speaking national with no identification claiming to be from Yemen, you're a prime target for them to maybe hold onto you and keep you around - and ask the immigration judge to move your case up so that the detention doesn't become too big of a headache for them.