Tests on the blood sample of a man charged with in the death of Kern County sheriff's deputy show two different levels of methamphetamine in his system.

The tests are significant because the district attorney's office said last week that lab officials had inadvertently destroyed Daniel Willsey's remaining blood sample. Defense attorneys wanted that sample for independent analysis.

"There was significant difference, their values were up about twice the values that we obtained," said Kern County Crime lab director Vernon Kyle.

Willsey is charged with vehicular homicide for a 2006 head-on collision that killed Deputy Joe Hudnall. Willsey also faces various drug and firearms charges.

The discrepancies between the blood tests could jeopardize the case against Willsey, who allegedly was high at the time of the crash. Kyle said Monday it "could be a possibility of concern."