NASA and EU should consider the option of sending the required laboratory to Mars in a one-way trip, even with a rover to bring the cached samples back to the landed lab.
What aspects of a life-determining laboratory must be present on earth that cannot be hardened for use on Mars?
No need to expensively quarantine samples on Earth, when the analysis is performed on Mars and the digital results sent back to Earth. The presence of fungal and bacterial life on Mars would wonderfully disrupt so-what thinking about exploring our solar system.
Better for NASA to consider the fastest and cheapest way to get the results from life-detecting analysis of the cached samples on Mars.