Yep. 2 different tests.
JAC’s was a roadside drug test. The secondary test for that is conducted on a station or van based Draegar drug testing instrument. The whole testing process including transporting to station is completed in tens of minutes depending on the drive.
Mam’s was a roadside drug test and then because he was reportedly hospitalised, a blood sample for scientific testing in a laboratory setting by Qld Health. That process is out of police control, the analysis is done by QHSS and takes whatever it takes. I have had certificates back in as little as 2 weeks for a pure alcohol test, other drug tests can take 5 weeks or longer because of the spread of substances they need to test for (and potentially the type of testing).
Depending on the results of said scientific testing, the investigators may require a medical opinion on the effects / quantity of any drugs detected in the system.
Additionally there are other investigations on-going with the other parties in the crash, forensic and mechanical examinations of the vehicles involved and so on.
Then depending on the specifics they may seek to interview Mam before taking any action or may commence proceedings straight away.
Every one of these jobs are different.