The USPTO has issued new guidelines regarding cannabis-derived goods and services. The guidelines were issued on May 2, 2019 and can be found here. The new guidelines explain that the 2018 Farm Bill exempts hemp, which is defined as cannabis plants and derivatives such as CBD that contain no more than 0.3% THC on a dry-weight basis.
Therefore, for trademark applications that identify goods and or services encompassing cannabis or CBD, the 2018 Farm Bill probably removes the CSA as a ground for refusal of the application so long as: (1) the good and/or services are derived from help; (2) The identification of goods and/or services specify that the hemp products contain less than 0.3% THC; and (3) the application was filed on or after Dec 20, 2018, except for prior filed application, the applicants have the option of amending the filing date and filing basis of the application to over the CSA as a ground of refusal.
However, be aware that hemp related goods and/or services may still raise legal issues under other laws include the Federal Food Drug and Cosmetic Act (FDCA).