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From the National Center for Education Statistics: An overwhelming majority of public elementary and secondary schools in the United States have systems in place to limit access to facilities.
Based on data compiled in 2007-08 from public school principals, the National Center for Education Statistics compiled this data in its Digest of Education Statistics 2011:
| Security measures present in PUBLIC schools, 2007-08 | ||
|---|---|---|
| 1 | Controlled access to buildings (doors locked or monitored) | 88.8% |
| 2 | Security cameras | 51.8% |
| 3 | Controlled access to grounds (gates locked or monitored) | 44.9% |
| 4 | Daily presence of police or security | 27.2% |
| 5 | Random dog sniffs | 25.0% |
| 6 | Random drug sweeps | 14.8% |
| 7 | Badges required | 7.5% |
| 8 | Random metal detector checks | 5.9% |
| 9 | Daily metal detector checks | 2.3% |
| Source: Digest for Education Statistics, 2011 | ||
