Can you suggest an easy scientific way to test whether or not a food product is fomalined/boraxed?

This is a problem in my country,many people tend to infuse artificial(and dangerous) chemical to preserve their food product. Even though the government has already forbid this unacceptable practice many people still do this thing all around this country. Many have been caught for doing this thing,but our Consumer department and Health department only investigate people and places in big cities even though there many people practicing this way in other smaller town.

The problem here is that I live in small town near a big city,I suspect that some food product(especially if it’s from traditional market) have been preserved with formaline and borax(which is not healthy for human) but I don’t know how to test whether or not this food product contain such harmful thing. Of course,our government and many TV media,after many of them exposed this unhealthy practice,introduce a way to identify formalined/boraxed food product but this method is none other than just sniffing and tasting method,which is ineffective in my opinion.

Those responsible department will visit bigger cities for periodic food investigation but they will never visit smaller town for the same purpose,and I can’t take the sample of ‘suspected food’ to these departments. I want to do something on my own to test food product but I don’t know what would be the most effective (and easiest) way to do that. I can visit my local pharmaceutical store,but it would be better if the method will involve household equipments (I don’t want to buy expensive research equipments).

would it be effective both for meat product and vegetables product?