FAR Eliminates Truth in Negotiations Act (TINA)
Federal Acquisition Circular (FAC) 2005-73, effective May 29, 2013, eliminated the Truth in Negotiations Act (TINA).
Now that I have your attention, the FAC did not eliminate the TINA. What the FAC did was to rename The TINA “Truthful Cost or Pricing Data”. This was just one of a number of changes to the Federal Acquisition Regulation (FAR) that resulted from positive law codifications.
Let’s discuss positive law codification of Public Laws 107-217 and 111-350 which were recently incorporated into the Federal Acquisition Regulation (FAR) at FAR 1.110. The former was revised, codified, and enacted as title 40, United States Code, Public Buildings, Property, and Works, and the latter was revised, codified, and enacted as title 41, United States Code, Public Contracts.
For those of you who are unfamiliar with positive law codification, a few words from Office of the Law Revision Counsel of the United States House of Representatives, the office responsible.
POSITIVE LAW CODIFICATION
Positive law codification by the Office of the Law Revision Counsel is the process of preparing and enacting a codification bill to restate existing law as a positive law title of the United States Code. The restatement conforms to the policy, intent, and purpose of Congress in the original enactments, but the organizational structure of the law is improved, obsolete provisions are eliminated, ambiguous provisions are clarified, inconsistent provisions are resolved, and technical errors are corrected.
THE TERM "POSITIVE LAW"
When used with respect to the United States Code—as in positive law codification or a positive law title of the Code–the term "positive law" has a special and particular meaning. In general, however, especially in legal philosophy, the term "positive law" is used more broadly. There is overlap to be sure. But the meaning of the term as used generally is not identical to the meaning of the term as used with respect to the Code, and the distinction must be understood to avoid confusion. 
In general, the term "positive law" connotes statutes, i.e., law that has been enacted by a duly authorized legislature.  As used in this sense, positive law is distinguishable from natural law. The term "natural law", especially as used generally in legal philosophy, refers to a set of universal principles and rules that properly govern moral human conduct. Unlike a statute, natural law is not created by human beings. Rather, natural law is thought to be the preexisting law of nature, which human beings can discover through their capacity for rational analysis.
Within the context of the Code, the term "positive law" is used in a more limited sense. A positive law title of the Code is a title that has been enacted as a statute. To enact the title, a positive law codification bill is introduced in Congress. The bill repeals existing laws on a certain subject and restates those laws in a new form–a positive law title of the Code. The titles of the Code that have not been enacted through this process are called non-positive law titles.
Non-positive law titles of the Code are compilations of statutes. The Office of the Law Revision Counsel is charged with making editorial decisions regarding the selection and arrangement of provisions from statutes into the non-positive law titles of the Code. Non-positive law titles, as such, have not been enacted by Congress, but the laws assembled in the non-positive law titles have been enacted by Congress.
In both positive law titles and non-positive law titles of the Code, all of the law set forth is positive law (in the general sense of the term) because the entire Code is a codification of Federal statutes enacted by Congress, and not of preexisting natural law principles.
 Why is there a specialized meaning for the term "positive law" with respect to the United States Code, and why is this term used despite the potential for confusion with the broader meaning given to the identical term in legal philosophy? The answer involves a historical solution to a statutory drafting problem. For generations, Congress has used the term "positive law" when it enacts a title of the Code, as such, into statutory law. For example, section 1 of the Act of July 30, 1947 (1 U.S.C. note prec. 1), provides in relevant part: "Title 1 of the United States Code entitled 'General Provisions', is codified and enacted into positive law . . . ." (emphasis added). Earlier legislative drafters chose the term "positive law" in order to capture the abstract distinction between a title of the Code that has been enacted, as such, versus a title of the Code that has not been enacted, as such, but that sets forth enacted statutes. More literally, this distinction might be expressed as "enacted title" versus "non-enacted title", but those literal terms are problematic since they incorrectly suggest that provisions set forth in a "non-enacted title" of the Code have not been enacted. Those provisions have been enacted, but as part of a number of freestanding statutes rather than as part of an enacted (positive law) title. The specialized use of the term "positive law" in this situation captures the abstract distinction between the two types of titles in the Code, and the use of the term in this way is now well established.
 "Positive law typically consists of enacted law—the codes, statutes, and regulations that are applied and enforced in the courts. The term derives from the medieval use of positum (Latin "established"), so that the phrase positive law literally means law established by human authority." Black's Law Dictionary 1200 (8th ed. 2004).
As a result of the two positive law codifications there are a number of changes to the FAR in terminology and statutory references. In the loose-leaf edition, the circular is 614 pages long.
As an example, the Truth in Negotiations Act is now Truthful Cost or Pricing Data, at 41 U.S.C. chapter 35. From an historical perspective, the “Truth in Negotiations Act” was not the Truth in Negotiations Act. Public Law 87-653 doesn’t even use the term “truth” in its text. Early authors used various terms, in addition to TINA, to refer to the act (e.g., “Defective Pricing Data Statute," "Defective Pricing Law," "Truth in Negotiations Statute" and “Truth-in-Negotiating Certificate"). (See Alan E. Kushnick’s Equitable Reduction Under the Defective Pricing Statute: Public Law 87-653, Santa Clara Law Review, 1-1-1968.)
In some instances the only change was dropping the word “Act”:
In other instances the changes were more substantial:
A word of caution and a recommendation for all of you who use the online FAR and search electronically. Out of long time habit, and a desire to know what specific changes are made in each FAC, I still maintain my loose-leaf version of the FAR. [Note: I am not a (total) Luddite. I do use the online versions of the FAR at Acquisition Central and the FARSite.] As such, I know the changes that were made as a result of the FAC under discussion were not limited just to changes in the names of statutes and their references. As a result of law revisions, there were other changes made to terminology. For example, for all of you Competition Advocates out there, you are no longer Competition Advocates; you are now Advocates for Competition. An electronic search for “Competition Advocate” will return zero hits. You had best know that Advocates for Competition are found in FAR Subpart 6.5, the same place where you used to be able to find Competition Advocates. I mention this as a word of caution for when you do electronic searches. What you may remember as a term you used routinely, and could find easily, may no longer exist. The recommendation would be to consider keeping your own loose-leaf version of the FAR. I do not have high hopes that this recommendation will be embraced wholeheartedly by one and all.
Finally, you should know that there was a Wifcon discussion about this topic in May: http://www.wifcon.com/discussion/index.php?/topic/2569-fac-2005-73-positive-law-codifications-of-title-41-usc/#entry22195. If you had not done so previously, you might look in.