This is not true.
Self employed individuals are prime targets for IRS audits because the income and expenses are generally only self reported (not independently submitted by a bank or employer), but there is no new law making this mandatory.
The new tax law passed in December has several changes that will impact self employed persons, but those are only for 2018, not the 2017 taxes due in April.
For more information about Self Employment income, and making sure you only claim verifiable expenses, follow these links:
IRS
Self Employment
Schedule C Instructions
TurboTax Schedule C for Self Employment