| Cover | Oct. 28, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 28, 2021 |
| Entity File Number | 000-54319 |
| Entity Registrant Name | LIFELOC TECHNOLOGIES, INC. |
| Entity Central Index Key | 0001493137 |
| Entity Tax Identification Number | 84-1053680 |
| Entity Incorporation, State or Country Code | CO |
| Entity Address, Address Line One | 12441 West 49th Ave. |
| Entity Address, Address Line Two | Unit 4 |
| Entity Address, City or Town | Wheat Ridge |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80033 |
| City Area Code | (303) |
| Local Phone Number | 431-9500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | LCTC |
| Entity Emerging Growth Company | false |
