The age-old convention is to use them in the body of the brief between the main headings 'Argument' and 'Conclusion.' They're dividers within the argument section.
The best tradition with these full-sentence headings is to make them both substantive and readable. They must say something. To be persuasive, they must incorporate reasoning.
The word because is among the most important words in any advocate's vocabulary. For example: This court should grant a temporary restraining order stopping Purvis from unfairly competing with American because Purvis signed an enforceable noncompete agreement when he sold his business to American.
Once you put four or five such headings into a table of contents, the whole argument becomes instantly plain to busy readers such as judges.
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