Final answer:
In legal writing, 'Acts', 'Codes', and 'Amendments' should all be capitalized as they are titles of specific legal documents that denote their official status.
Step-by-step explanation:
In legal writing, proper nouns, including the titles of documents such as Acts, Codes, and Amendments, should be capitalized. This is because they are specific titles of legal documents. For example, when you refer to the 'Civil Rights Act', 'Internal Revenue Code', or the 'First Amendment', all these titles are capitalized to denote their official, formal status in legal texts.
Moreover, capitalizing such terms helps distinguish between the general concept and the specific legal entity or document. It emphasizes the formality and specificity required in legal documents. However, one must remember that not all words associated with these terms are capitalized; for instance, words like 'the' or 'of' in the middle of these titles typically remain in lowercase unless they are the first word in the citation.