Here is the announcement from the Federal Motor Carrier Safety Administration. You can download a copy of the Guidance at the link.

FMCSA COVID-19 Pre-Employment Testing Guidance

On June 5, 2020, the Federal Motor Carrier Safety Administration (FMCSA) granted a three-month waiver from certain pre-employment testing requirements applicable to employers of drivers subject to 49 CFR part 382. For more details, visit the FMCSA web page https://www.fmcsa.dot.gov/emergency/three-month-waiver-response-economic-consequences-covid-19-public-health-emergency.