It will be great if you succeed to write a script that detects members sendig Merits to each others.
I don't think it is going to be hard to code such script but you will need an access to the Merit database.
We already have several tools for this purpose, you can see one here done by @DdmrDdmr
https://public.tableau.com/profile/ddmrddmr#!/vizhome/BitcointalkMeritDashboard/GlobalSummary