Ma Shuai died not by accident, but by drug poisoning, in which ricin was used. Ricin actually exists in our lives. It is a highly toxic plant protein extracted from ricin, a common plant in rural areas.

Ricinus communis

In the last century, castor was planted on a large scale in China. Many rural elderly people should be impressed. At that time, castor was regarded as an important cash crop.

According to parents, some children can use castor seeds to pay their tuition when they are studying. The planted castor beans are sold to professional purchasers through the production team every year. It seems that a catty is only twenty or thirty cents, and some people used to pick it up as pocket money.

But castor is not a native plant in China, but an alien invasive species. Castor is native to tropical countries such as Egypt and India, and the castor planted in China was introduced from India.

This is an annual or perennial herb, belonging to Ricinus of Euphorbiaceae. Its plants are very tall, can grow to more than four or five meters, with thick stems and plump leaves. Castor's fruit has thorns outside, which looks like an ancient weapon mace. Because of these characteristics, castor can be easily identified.