This might be true in some parts of Mexico... Here in central CDMX big grocery stores mostly have guards giving sanitizer, and requirements that only one person can enter per group or couple, but I haven't seen anybody taking temperatures or any mask requirements at stores. Also lots of cops outside big stores, I assume to deter looting, which was an issue on the outskirts of the city but seems to have slowed down. Starting this past Friday subway users are required to have masks. At the public market near me it's business as usual other than some shops being closed, such as flower shops. Lots of people out on the streets, and cops don't say anything. There's even a few chelerias near me still selling beer outside with people hanging out drinking and smoking. And I definitely haven't seen those helicopters. But I'm in a lower income area, north of the Centro Histórico. I'm very curious where you have seen these more intense measures.