Lies are often easy to conceal. LOL
Lies alone don't make it perjury.
The US Attorneys Office says this about perjury:
The third element of a perjury offense is proof of specific intent, that is, that the defendant made the false statement with knowledge of its falsity, rather than as a result of confusion, mistake or faulty memory. United States v. Dunnigan, 507 U.S. 87, 94 (1993). Section 1621 requires that the defendant have acted "willfully"; the section 1623 requirement is to act "knowingly." In practice, these standards are virtually identical, although the government need not prove both willfulness and knowledge to sustain a section 1623 prosecution. United States v. Fornaro, 894 F.2d 508, 512 (2d Cir. 1990). Under either statute, the government must demonstrate the defendant voluntarily made the false statement with knowledge of its falsity. If the defendant believed his or her statement to be true when it was made, even though it was false, this essential element will not have been proven. See this Manual at 1753.
1747. Elements Of Perjury -- Specific Intent | USAM | Department of Justice
The first type of perjury involves statements made under oath, and requires proof that:
A person took an oath to truthfully testify, declare, depose, or certify, verbally or in writing;
The person made a statement that was not true;
The person knew the statement to be untrue;
The person made the false statement willfully; and
The subject matter of the statement was material to the proceeding in which it was made.
The second type of perjury involves unsworn statements, and requires proof that:
A person made an unsworn declaration as permitted by federal law;
The statement was made "under penalty of perjury";
The person willfully made a statement that he or she did not believe to be true; and
The subject matter of the statement was material.
State laws defining perjury are generally similar to the federal statute. Ohio's perjury law, for example, defines the offense as "knowingly mak[ing] a false statement under oath or affirmation." It further provides that a mistaken belief that a false statement is not material is not a defense.
Perjury Overview :: Justia
Specific intent.
A lie told without the intent to deceive, even if told under oath, isn't perjurious.
Specific intent.
These days, you break one of their laws, you'll be prosecuted.