Immigration attorneys have said for months that it’s becoming increasingly difficult to get an H-1B specialty occupation visa. They’re right.

Evidence requests on H-1B applications shot up from 16.7 percent of all adjudicated applications in August to 46.6 percent in November, according to data provided to Bloomberg Law Dec. 19 by U.S. Citizenship and Immigration Services. The 46.6 percent figure is also up from November 2016, when the rate was 27.2 percent.

Requests for evidence, or RFEs, seek additional information...