Updated: Nov 21, 2019
The US President has signed the 2019 NDAA into law, banning the use of Dahua and Hikvision (and their OEMs) for the US government, for US government-funded contracts and possibly for 'critical infrastructure' and 'national security' usage.
This completes the legal process that started in May with the US House passing the bill with the ban and the August 1st Senate passing of the bill.
Direct Impact - Stop Purchasing and Removals
The ban technically starts one year after signing into law, which will be August 13, 2019. However, since the ban includes both purchasing and using existing equipment, it effectively starts immediately since it would make little practical sense to buy equipment today to have to remove it in 12 months.
The removal of Dahua and Hikvision branded equipment will be relatively straightforward since US government agencies can simply read the label on the devices. However, OEMs, which are included under the 'produced' for 'affiliates' clause, will also have to be removed.
Broader Indirect Impact - Branding
Since the US government is effectively blacklisting Dahua and Hikvsion products, this will have a severe branding and consequentially purchasing impact. Many buyers will be concerned about:
What security risks those products pose for them
What problems might occur if they want to integrate with public / government systems
What future legislation at the state or local level might ban usage of such systems
The following reports provide background about Hikvision and Dahua: