Sentence examples for difficult to certify from inspiring English sources

That made it very difficult to certify a bill as being solely English.

That combination often makes it difficult to certify the precise cause, particularly among older patients who die with more than one ailment.

Absolute values for DNA isolation procedures are difficult to certify, hence comparative results on community structures obtained using standardized ARISA with identical primers are of value.

Another issue is that the low-value, moisture-rich biomass flows that are being used are less homogeneous than the standardised, dry wood pellets that are being traded internationally, and therefore difficult to certify.

Among the controversial provisions were changes to labor law for rail and airline workers -- backed by the airline industry -- that would count anyone who did not vote in an election for a union as voting against it, making it much more difficult to certify attempts to organize new unions.

The following paragraphs explain why it is difficult to certify GNSS-based solutions for railway safety-related applications.

The NNSA plan's major technical drawback, she added, is that it could be difficult for the agency to certify that its new warheads are safe, secure and reliable without nuclear explosive testing.

Another would make it more difficult to transfer any of the detainees to another country by requiring the defense secretary, Robert Gates, to certify that the destination country has met a strict set of security requirements.

A doctor has to certify the cause of death, but getting to a doctor who can -- or will -- sign the death certificate and identify the causes of death can be difficult.

Twitter announces plans to certify third-party apps for businesses.

(Several of the states have yet to certify their results).