The following year, Japanese and American scientists in Hawaii used a similar technique to produce clones of mice. Concerns about genetic engineering. Despite its many benefits, genetic engineering has caused concern among some people. Some oppose genetic engineering because they fear that harmful, uncontrollable bacteria might be produced accidentally. Others worry about possible environmental damage by the deliberate introduction of organisms whose heredity has been altered.
Some people also question the morality of manipulating the genetic material of living creatures.
In addition, the successful cloning of mammals has led many to debate the possible benefits and drawbacks of human cloning. These guidelines have been gradually relaxed because such research was proved safe. In 1985, the NIH approved experimental guidelines for treatment in which genes are transplanted to correct hereditary defects in human beings. In 1987, a committee of the National Academy of Sciences concluded that transferring genes between species of organisms posed no serious environmental hazards. In 1997, the USDA amended its regulations on genetically engineered plants.