Pesticide poisoning occurs most commonly through skin contact. Some pesticides can soak through skin quite easily.
Concentrates are especially dangerous.
Also, two areas of your body, your head and genitals absorb pesticide very fast and need extra protection. If pesticide spills on you, your skin will absorb most of it within minutes. Wash off the pesticide immediately. Avoid direct contact with pesticides by wearing protective clothing. The pesticide label will tell you what protective equipment is necessary.