USCA Index

In the USCA index, under the phrase 'Habeas Corpus,' there exist over two pages of entries.  Scanning the list under 'Habeas Corpus,' you will come to an entry for 'Limitation of Action, State court judgments.'   This refers you to 28 USC 2244.  This appears to be the most relevant statute for addressing the attorney's question as to the number of habeas petitions a person may file.  One has to read the language of the statute to know for sure.

Ideally, there would have been an index entry for "number of federal habeas appeals that a prisoner may file."  However, as a legal researcher, one is seldom so lucky.  Instead, as a researcher, you will have to make the intuitive connection that "Limitation of Action" might speak to the issue of the number of federal habeas appeals that a prisoner may file.  (Perhaps this is why the practice of law requires both a graduate degree and a license.)

USC Index

The USC index has less than one page of entries under the phrase 'Habeas Corpus.'   However, one of the entries is '"Subsequent application after denial," which refers you to 28 USC 2244.

USCS Index

The USCS Index has approximately the same number of entries as the USCA index.   The entry, "Subsequent application after denial," appears to be the most relevant for addressing the attorney's question as to the number of habeas petitions a person may file.  It refers you to 28 USC 2244.