A seven second medical exam accomplishes none of these things.Of course there were laws. The medical exam was responsible for separating parents from children, and many people were sent back where they came from if they were ill, or mentally challenged. Plus they paid passage, they didn't just hop the border like thieves in the night. We were careful who we accepted, not like today where we welcome drunks, and rapists, criminals of all types, the world's pond scum.
More than 98% of people were processed and in the country within two hours. Do you seriously think that if we built welcome centers on the border and told people they would have to wait two house that we would have any illegal immigration?