One of their reference links (https://www.dhs.gov/news/2017/05/25/written-testimony-cbp-senate-homeland-security-and-governmental-affairs-permanent https://www.

One of their reference links (https://www.dhs.gov/news/2017/05/25/written-testimony-cbp-senate-homeland-security-and-governmental-affairs-permanent https://www.dhs.gov/news/2017/05/25/written-testimony-cbp-se...) does mention that they are piloting a study to see if dogs can detect fetanyl, but I'm guessing it's either not going great, or they just want to explore some other options.